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tcpbridge(1)                     User Commands                    tcpbridge(1)




NAME

       tcpbridge - Bridge network traffic across two interfaces


SYNOPSIS

       tcpbridge [-flags] [-flag [value]] [--option-name[[=| ]value]]

       All arguments must be options.

       tcpbridge is a tool for selectively bridging network traffic across two
       interfaces and optionally modifying the packets in between


DESCRIPTION

       The basic operation of tcpbridge is to be a network bridge between  two
       subnets.  All packets received on one interface are sent via the other.

       Optionally, packets can be edited in a variety  of  ways  according  to
       your needs.

       For  more  details,  please  see the Tcpreplay Manual at: http://tcpre-
       play.appneta.com<


OPTIONS


       -r string, --portmap=string
              Rewrite TCP/UDP ports.  This option may appear up to 9999 times.

              Specify  a  list  of comma delimited port mappings consisting of
              colon delimited port number pairs.  Each  colon  delimited  port
              pair  consists  of the port to match followed by the port number
              to rewrite.

              Examples:
                  --portmap=80:8000 --portmap=8080:80    # 80->8000 and 8080->80
                  --portmap=8000,8080,88888:80           # 3 different ports become 80
                  --portmap=8000-8999:80                 # ports 8000 to 8999 become 80

       -s number, --seed=number
              Randomize src/dst IPv4/v6 addresses w/ given seed.  This  option
              may appear up to 1 times.  This option must not appear in combi-
              nation with any  of  the  following  options:  fuzz-seed.   This
              option takes an integer number as its argument.

              Causes the source and destination IPv4/v6 addresses to be pseudo
              randomized  but  still  maintain  client/server   relationships.
              Since  the randomization is deterministic based on the seed, you
              can reuse the same seed value to recreate the traffic.

       -N string, --pnat=string
              Rewrite IPv4/v6 addresses using  pseudo-NAT.   This  option  may
              appear  up  to 2 times.  This option must not appear in combina-
              tion with any of the following options: srcipmap.

              Takes a comma delimited series of colon delimited CIDR  netblock
              pairs.   Each netblock pair is evaluated in order against the IP
              addresses.  If the IP address in the packet  matches  the  first
              netblock,  it  is  rewritten using the second netblock as a mask
              against the high order bits.

              IPv4 Example:
                  --pnat=192.168.0.0/16:10.77.0.0/16,172.16.0.0/12:10.1.0.0/24
              IPv6 Example:
                  --pnat=[2001:db8::/32]:[dead::/16],[2001:db8::/32]:[::ffff:0:0/96]

       -S string, --srcipmap=string
              Rewrite source IPv4/v6 addresses using pseudo-NAT.  This  option
              may appear up to 1 times.  This option must not appear in combi-
              nation with any of the following options: pnat.

              Works just like the --pnat option, but only affects  the  source
              IP addresses in the IPv4/v6 header.

       -D string, --dstipmap=string
              Rewrite  destination  IPv4/v6  addresses using pseudo-NAT.  This
              option may appear up to 1 times.  This option must not appear in
              combination with any of the following options: pnat.

              Works just like the --pnat option, but only affects the destina-
              tion IP addresses in the IPv4/v6 header.

       -e string, --endpoints=string
              Rewrite IP addresses to be between two endpoints.   This  option
              may  appear  up to 1 times.  This option must appear in combina-
              tion with the following options: cachefile.

              Takes a pair of colon delimited IPv4/v6 addresses which will  be
              used  to  rewrite all traffic to appear to be between the two IP
              addresses.

              IPv4 Example:
                  --endpoints=172.16.0.1:172.16.0.2
              IPv6 Example:
                  --endpoints=[2001:db8::dead:beef]:[::ffff:0:0:ac:f:0:2]

       --tcp-sequence=number
              Change TCP Sequence (and  ACK)  numbers  /w  given  seed.   This
              option  takes  an  integer number as its argument.  The value of
              number is constrained to being:
                  greater than or equal to 1
              The default number for this option is:
                   0

              Change all TCP sequence numbers, and related sequence-acknowl-
              edgement numbers.  They will be shifted by a random amount based
              on the provided seed.

       -b, --skipbroadcast
              Skip rewriting broadcast/multicast IPv4/v6 addresses.

              By default --seed, --pnat and --endpoints will rewrite broadcast
              and multicast IPv4/v6 and MAC addresses. Setting this flag will
              keep broadcast/multicast IPv4/v6 and MAC addresses from being
              rewritten.

       -C, --fixcsum
              Force recalculation of IPv4/TCP/UDP header checksums.

              Causes each IPv4/v6 packet to have their checksums recalculated
              and fixed.  Automatically enabled for packets modified with
              --seed, --pnat, --endpoints or --fixlen.

       -m number, --mtu=number
              Override default MTU length (1500 bytes).  This option may
              appear up to 1 times.  This option takes an integer number as
              its argument.  The value of number is constrained to being:
                  in the range  1 through MAXPACKET

              Override the default 1500 byte MTU size for determining the max-
              imum padding length (--fixlen=pad) or when truncating (--mtu-
              trunc).

       --mtu-trunc
              Truncate packets larger then specified MTU.  This option may
              appear up to 1 times.

              Similar to --fixlen, this option will truncate data in packets
              from Layer 3 and above to be no larger then the MTU.

       -E, --efcs
              Remove Ethernet checksums (FCS) from end of frames.

              Note, this option is pretty dangerous!  We do not actually check
              to see if a FCS actually exists in the frame, we just blindly
              delete the last 4 bytes.  Hence, you should only use this if you
              know know that your OS provides the FCS when reading raw pack-
              ets.

       --ttl=string
              Modify the IPv4/v6 TTL/Hop Limit.

              Allows you to modify the TTL/Hop Limit of all the IPv4/v6 pack-
              ets.  Specify a number to hard-code the value or +/-value to
              increase or decrease by the value provided (limited to 1-255).

              Examples:
                  --ttl=10
                  --ttl=+7
                  --ttl=-64

       --tos=number
              Set the IPv4 TOS/DiffServ/ECN byte.  This option may appear up
              to 1 times.  This option takes an integer number as its argu-
              ment.  The value of number is constrained to being:
                  in the range  0 through 255

              Allows you to override the TOS (also known as DiffServ/ECN)
              value in IPv4.

       --tclass=number
              Set the IPv6 Traffic Class byte.  This option may appear up to 1
              times.  This option takes an integer number as its argument.
              The value of number is constrained to being:
                  in the range  0 through 255

              Allows you to override the IPv6 Traffic Class field.

       --flowlabel=number
              Set the IPv6 Flow Label.  This option may appear up to 1 times.
              This option takes an integer number as its argument.  The value
              of number is constrained to being:
                  in the range  0 through 1048575

              Allows you to override the 20bit IPv6 Flow Label field.  Has no
              effect on IPv4 packets.

       -F string, --fixlen=string
              Pad or truncate packet data to match header length.  This option
              may appear up to 1 times.

              Packets may be truncated during capture if the snaplen is
              smaller then the packet.  This option allows you to modify the
              packet to pad the packet back out to the size stored in the
              IPv4/v6 header or rewrite the IP header total length to reflect
              the stored packet length.

              pad Truncated packets will be padded out so that the packet
              length matches the IPv4 total length

              trunc Truncated packets will have their IPv4 total length field
              rewritten to match the actual packet length

              del Delete the packet

       --fuzz-seed=number
              Fuzz 1 in X packets. Edit bytes, length, or emulate packet drop.
              This option takes an integer number as its argument.  The value
              of number is constrained to being:
                  greater than or equal to 0
              The default number for this option is:
                   0

              This fuzzing was designed as to test layer 7 protocols such as
              voip protocols.  It modifies randomly 1 out of X packets (where
              X = --fuzz-factor) in order for stateful protocols to cover more
              of their code.  The random fuzzing actions focus on data start
              and end because it often is the part of the data application
              protocols base their decisions on.

              Possible fuzzing actions list:
               * drop packet
               * reduce packet size
               * edit packet Bytes:
                 * Not all Bytes have the same probability of appearance in
              real life.
                   Replace with 0x00, 0xFF, or a random byte with equal like-
              lihood.
                 * Not all Bytes have the same significance in a packet.
                   Replace the start, the end, or the middle of the packet
              with equal likelihood.
               * do nothing (7 out of 8 packets)

       --fuzz-factor=number
              Set the Fuzz 1 in X packet ratio (default 1 in 8 packets).  This
              option must appear in combination with the following options:
              fuzz-seed.  This option takes an integer number as its argument.
              The value of number is constrained to being:
                  greater than or equal to 1
              The default number for this option is:
                   8

              Sets the ratio of for --fuzz-seed option. By default this value
              is 8, which means 1 in 8 packets are modified by fuzzing. Note
              that this ratio is based on the random number generated by the
              supplied fuzz seed. Therefore by default you cannot expect that
              exactly every eighth packet will be modified.

       --skipl2broadcast
              Skip rewriting broadcast/multicast Layer 2 addresses.

              By default, editing Layer 2 addresses will rewrite broadcast and
              multicast MAC addresses.   Setting this flag will keep broad-
              cast/multicast MAC addresses from being rewritten.

       --dlt=string
              Override output DLT encapsulation.  This option may appear up to
              1 times.

              By default, no DLT (data link type) conversion will be made.  To
              change the DLT type of the output pcap, select one of the fol-
              lowing values:

              enet Ethernet aka DLT_EN10MB

              hdlc Cisco HDLC aka DLT_C_HDLC

              jnpr_ether Juniper Ethernet DLT_C_JNPR_ETHER

              pppserial PPP Serial aka DLT_PPP_SERIAL

              user User specified Layer 2 header and DLT type

       --enet-dmac=string
              Override destination ethernet MAC addresses.  This option may
              appear up to 1 times.

              Takes a pair of comma deliminated ethernet MAC addresses which
              will replace the destination MAC address of outbound packets.
              The first MAC address will be used for the server to client
              traffic and the optional second MAC address will be used for the
              client to server traffic.

              Example:
                  --enet-dmac=00:12:13:14:15:16,00:22:33:44:55:66

       --enet-smac=string
              Override source ethernet MAC addresses.  This option may appear
              up to 1 times.

              Takes a pair of comma deliminated ethernet MAC addresses which
              will replace the source MAC address of outbound packets.  The
              first MAC address will be used for the server to client traffic
              and the optional second MAC address will be used for the client
              to server traffic.

              Example:
                  --enet-smac=00:12:13:14:15:16,00:22:33:44:55:66

       --enet-subsmac=string
              Substitute MAC addresses.  This option may appear up to 9999
              times.

              Allows you to rewrite ethernet MAC addresses of packets. It
              takes comma delimited pair or MACs address and rewrites all
              occurrences of the first MAC with the value of the second MAC.
              Example:
                  --enet-subsmac=00:12:13:14:15:16,00:22:33:44:55:66

       --enet-mac-seed=number
              Randomize MAC addresses.  This option may appear up to 1 times.
              This option must not appear in combination with any of the fol-
              lowing options: enet-smac, enet-dmac, enet-subsmac.  This option
              takes an integer number as its argument.

              Allows you to randomize ethernet MAC addresses of packets,
              mostly like what --seed option does for IPv4/IPv6 addresses.

       --enet-mac-seed-keep-bytes=number
              Randomize MAC addresses.  This option may appear up to 1 times.
              This option must appear in combination with the following
              options: enet-mac-seed.  This option takes an integer number as
              its argument.  The value of number is constrained to being:
                  in the range  1 through 6

              Keep some bytes untouched when usinging --enet-mac-seed option.

       --enet-vlan=string
              Specify ethernet 802.1q VLAN tag mode.  This option may appear
              up to 1 times.

              Allows you to rewrite ethernet frames to add a 802.1q header to
              standard 802.3 ethernet headers or remove the 802.1q VLAN tag
              information.

              add Rewrites the existing 802.3 ethernet header as an 802.1q
              VLAN header

              del Rewrites the existing 802.1q VLAN header as an 802.3 ether-
              net header

       --enet-vlan-tag=number
              Specify the new ethernet 802.1q VLAN tag value.  This option may
              appear up to 1 times.  This option must appear in combination
              with the following options: enet-vlan.  This option takes an
              integer number as its argument.  The value of number is con-
              strained to being:
                  in the range  0 through 4095


       --enet-vlan-cfi=number
              Specify the ethernet 802.1q VLAN CFI value.  This option may
              appear up to 1 times.  This option must appear in combination
              with the following options: enet-vlan.  This option takes an
              integer number as its argument.  The value of number is con-
              strained to being:
                  in the range  0 through 1


       --enet-vlan-pri=number
              Specify the ethernet 802.1q VLAN priority.  This option may
              appear up to 1 times.  This option must appear in combination
              with the following options: enet-vlan.  This option takes an
              integer number as its argument.  The value of number is con-
              strained to being:
                  in the range  0 through 7


       --hdlc-control=number
              Specify HDLC control value.  This option may appear up to 1
              times.  This option takes an integer number as its argument.

              The Cisco HDLC header has a 1 byte "control" field.  Apparently
              this should always be 0, but if you can use any 1 byte value.

       --hdlc-address=number
              Specify HDLC address.  This option may appear up to 1 times.
              This option takes an integer number as its argument.

              The Cisco HDLC header has a 1 byte "address" field which has two
              valid values:

              0x0F Unicast

              0xBF Broadcast
              You can however specify any single byte value.

       --user-dlt=number
              Set output file DLT type.  This option may appear up to 1 times.
              This option takes an integer number as its argument.

              Set the DLT value of the output pcap file.

       --user-dlink=string
              Rewrite Data-Link layer with user specified data.  This option
              may appear up to 2 times.

              Provide a series of comma deliminated hex values which will be
              used to rewrite or create the Layer 2 header of the packets.
              The first instance of this argument will rewrite both server and
              client traffic, but if this argument is specified a second time,
              it will be used for the client traffic.

              Example:
                  --user-dlink=01,02,03,04,05,06,00,1A,2B,3C,4D,5E,6F,08,00

       -d number, --dbug=number
              Enable debugging output.  This option may appear up to 1 times.
              This option takes an integer number as its argument.  The value
              of number is constrained to being:
                  in the range  0 through 5
              The default number for this option is:
                   0

              If configured with --enable-debug, then you can specify a ver-
              bosity level for debugging output.  Higher numbers increase ver-
              bosity.

       -i string, --intf1=string
              Primary interface (listen in uni-directional mode).  This option
              may appear up to 1 times.


       -I string, --intf2=string
              Secondary interface (send in uni-directional mode).  This option
              may appear up to 1 times.


       -u, --unidir
              Send and receive in only one direction.  This option may appear
              up to 1 times.

              Normally, tcpbridge will send and receive traffic in both direc-
              tions (bi-directionally).  However, if you choose this option,
              traffic will be sent uni-directionally.

       --listnics
              List available network interfaces and exit.


       -L number, --limit=number
              Limit the number of packets to send.  This option may appear up
              to 1 times.  This option takes an integer number as its argu-
              ment.  The value of number is constrained to being:
                  greater than or equal to 1
              The default number for this option is:
                   -1

              By default, tcpbridge will send packets forever or until Ctrl-C.
              Alternatively, you can specify a maximum number of packets to
              send.

       -M string, --mac=string
              MAC addresses of local NIC's.  This option may appear up to 2
              times.

              tcpbridge does not support detecting the MAC addresses of the
              local network interfaces under Windows.  Please specify both MAC
              addresses of the interfaces used in the bridge: -M <intf1 mac>
              -M <intf2 mac>

       -x string, --include=string
              Include only packets matching rule.  This option may appear up
              to 1 times.  This option must not appear in combination with any
              of the following options: exclude.

              Override default of sending all packets stored in the capture
              file and only send packets which match the provided rule.  Rules
              can be one of:


              S:<CIDR1>,...  - Source IP must match specified CIDR(s)

              D:<CIDR1>,...  - Destination IP must match specified CIDR(s)

              B:<CIDR1>,...  - Both source and destination IP must match spec-
              ified CIDR(s)

              E:<CIDR1>,...  - Either IP must match specified CIDR(s)

              P:<LIST> - Must be one of the listed packets where the list cor-
              responds to the packet number in the capture file.
                  --include=P:1-5,9,15,72-
              would send packets 1 through 5, the 9th and 15th packet, and
              packets 72 until the end of the file

              F:'<bpf>' - BPF filter.  See the tcpdump(8) man page for syntax.

       -X string, --exclude=string
              Exclude any packet matching this rule.  This option may appear
              up to 1 times.  This option must not appear in combination with
              any of the following options: include.

              Override default of sending all packets stored in the capture
              file and only send packets which do not match the provided rule.
              Rules can be one of:


              S:<CIDR1>,...  - Source IP must not match specified CIDR(s)

              D:<CIDR1>,...  - Destination IP must not match specified CIDR(s)

              B:<CIDR1>,...  - Both source and destination IP must not match
              specified CIDR(s)

              E:<CIDR1>,...  - Either IP must not match specified CIDR(s)

              P:<LIST> - Must not be one of the listed packets where the list
              corresponds to the packet number in the capture file.
                  --exclude=P:1-5,9,15,72-
              would drop packets 1 through 5, the 9th and 15th packet, and
              packets 72 until the end of the file

       -P, --pid
              Print the PID of tcpbridge at startup.


       -v, --verbose
              Print decoded packets via tcpdump to STDOUT.  This option may
              appear up to 1 times.


       -A string, --decode=string
              Arguments passed to tcpdump decoder.  This option may appear up
              to 1 times.  This option must appear in combination with the
              following options: verbose.

              When enabling verbose mode (-v) you may also specify one or more
              additional  arguments to pass to tcpdump to modify the way pack-
              ets are decoded.  By default, -n and -l are used.   Be  sure  to
              quote the arguments like: --verbose="-axxx" so that they are not
              interpreted by tcpbridge.  The following arguments are valid:
                  [ -aAeNqRStuvxX ]
                  [ -E spi@ipaddr algo:secret,... ]
                  [ -s snaplen ]

       -V, --version
              Print version information.


       -h, --less-help
              Display less usage information and exit.


       -H, --help
              Display usage information and exit.

       -!, --more-help
              Pass the extended usage information through a pager.

       --save-opts [=cfgfile]
              Save the option state to cfgfile.  The default is the last con-
              figuration file listed in the OPTION PRESETS section, below.
              The command will exit after updating the config file.

       --load-opts=cfgfile, --no-load-opts
              Load options from cfgfile.  The no-load-opts form will disable
              the loading of earlier config/rc/ini files.  --no-load-opts is
              handled early, out of order.



OPTION PRESETS

       Any option that is not marked as not presettable may be preset by load-
       ing values from configuration ("RC" or ".INI") file(s).  The homerc
       file is "$$/", unless that is a directory.  In that case, the file
       ".tcpbridgerc" is searched for within that directory.


FILES

       See OPTION PRESETS for configuration files.


EXIT STATUS

       One of the following exit values will be returned:

       0  (EXIT_SUCCESS)
              Successful program execution.

       1  (EXIT_FAILURE)
              The operation failed or the command syntax was not valid.

       66  (EX_NOINPUT)
              A specified configuration file could not be loaded.

       70  (EX_SOFTWARE)
              libopts had an internal operational error.  Please report it to
              autogen-users@lists.sourceforge.net.  Thank you.



AUTHORS

       Copyright 2013-2018 Fred Klassen - AppNeta Copyright 2000-2012 Aaron
       Turner For support please use the tcpreplay-users@lists.sourceforge.net
       mailing list.  The latest version of this software is always available
       from: http://tcpreplay.appneta.com/


COPYRIGHT

       Copyright (C) 2000-2018 Aaron Turner and Fred Klassen all rights
       reserved.  This program is released under the terms of the GNU General
       Public License, version 3 or later.


BUGS

       Please send bug reports to: tcpreplay-users@lists.sourceforge.net


NOTES

       This manual page was AutoGen-erated from the tcpbridge option defini-
       tions.



tcpbridge                         10 Nov 2018                     tcpbridge(1)

tcpreplay 4.3.0 - Generated Sat Nov 17 09:35:05 CST 2018
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