All arguments must be options.
tcprewrite currently supports reading the following DLT types:
DLT_C_HDLC aka Cisco HDLC
DLT_EN10MB aka Ethernet
DLT_LINUX_SLL aka Linux Cooked Socket
DLT_RAW aka RAW IP
DLT_NULL aka BSD Loopback
DLT_LOOP aka OpenBSD Loopback
DLT_IEEE802_11 aka 802.11a/b/g
DLT_IEEE802_11_RADIO aka 802.11a/b/g with Radiotap headers
Please see the --dlt option for supported DLT types for writing.
The packet editing features of tcprewrite which distinguish between "client" and "server" traffic requires a tcpprep(1) cache file.
For more details, please see the Tcpreplay Manual at: http://tcpreplay.synfin.net/trac/wiki/manual
Specify a list of comma delimited port mappingings 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.
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.
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 rewriten using the second netblock as a mask against the high order bits.
Works just like the --pnat option, but only affects the source IP addresses in the IPv4/v6 header.
Works just like the --pnat option, but only affects the destination IP addresses in the IPv4/v6 header.
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's.
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.
Causes each IPv4/v6 packet to have it's checksums recalcualted and fixed. Automatically enabled for packets modified with --seed, --pnat, --endpoints or --fixlen.
in the range 1 through MAXPACKET
Override the default 1500 byte MTU size for determining the maximum padding length (--fixlen=pad) or when truncating (--mtu-trunc).
Similar to --fixlen, this option will truncate data in packets from Layer 3 and above to be no larger then the MTU.
Note, this option is pretty dangerous! We don't actually check to see if a FCS actually exists in the frame, we just blindly delete the last two bytes. Hence, you should only use this if you know know that your OS provides the FCS when reading raw packets.
Allows you to modify the TTL/Hop Limit of all the IPv4/v6 packets. Specify a number to hard-code the value or +/-value to increase or decrease by the value provided (limited to 1-255).
--ttl=10 --ttl=+7 --ttl=-64
in the range 0 through 255
Allows you to override the TOS (also known as DiffServ/ECN) value in IPv4.
in the range 0 through 255
Allows you to override the IPv6 Traffic Class field.
in the range 0 through 1048575
Allows you to override the 20bit IPv6 Flow Label field. Has no effect on IPv4 packets.
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
By default, editing Layer 2 addresses will rewrite
broadcast and multicast MAC addresses. Setting this flag
will keep broadcast/multicast MAC addresses from being rewritten.
By default, no DLT (data link type) conversion will be made. To change the DLT type of the output pcap, select one of the following values:
enet Ethernet aka DLT_EN10MB
hdlc Cisco HDLC aka DLT_C_HDLC
User specified Layer 2 header and DLT type
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.
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.
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 ethernet header
in the range 0 through 4095
in the range 0 through 1
in the range 0 through 7
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.
The Cisco HDLC header has a 1 byte "address" field which has two valid values:
You can however specify any single byte value.
Set the DLT value of the output pcap file.
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.
in the range 0 through 5The default number for this option is:
If configured with --enable-debug, then you can specify a verbosity level for debugging output. Higher numbers increase verbosity.
Use tcpprep cache file to split traffic based upon client/server relationships.
When enabling verbose mode (-v) you may also specify one or more additional arguments to pass to tcpdump to modify the way packets are decoded. By default, -n and -l are used. Be sure to quote the arguments so that they are not interpreted by tcprewrite. Please see the tcpdump(1) man page for a complete list of options.
Enable advanced evasion techniques using the built-in fragroute(8) engine. See the fragroute(8) man page for more details. Important: tcprewrite does not support the delay, echo or print commands.
Apply the fragroute engine to packets going c2s, s2c or both when using a cache file.
In some cases, packets can't be decoded or the requested editing is not possible. Normally these packets are written to the output file unedited so that tcpprep cache files can still be used, but if you wish, these packets can be suppressed.
One example of this is 802.11 management frames which contain no data.
For support please use the firstname.lastname@example.org mailing list.
The latest version of this software is always available from: http://tcpreplay.synfin.net/
Released under the Free BSD License.
This manual page was AutoGen-erated from the tcprewrite option definitions.