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tcprewrite - Rewrite the packets in a pcap file.
Synopsis
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tcprewrite [-flag [value]].. [--opt-name [[=| ]value]]..
All arguments must be options.
Description
This manual page briefly documents the tcprewrite command. Tcprewrite is a tool to rewrite packets stored in pcap(3) file format, such ascrated by tools such as tcpdump(1) and ethereal(1). Once a pcap file has had it's packets rewritten, they can be replayed back out on the networkusing tcpreplay(1).
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
Options
-rstring, --portmap=string
Rewrite TCP/UDP ports. This option may appear up to -1 times.Specify a list of comma delimited port mappingings consisting of colon delimited port number pairs. Each colon delimited port pair consists of the port tomatch followed by the port number to rewrite.
Examples:
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Causes the source and destination IPv4/v6 addresses to be pseudo randomized but still maintain client/server relationships. Since the randomization isdeterministic 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 addressin the packet matches the first netblock, it is rewriten using the second netblock as a mask against the high order bits.
IPv4 Example:IPv6 Example:
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.
IPv4 Example:IPv6 Example:
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.
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 valueprovided (limited to 1-255).
Examples:
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 tothe 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
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 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 beused for the server to client traffic and the optional second MAC address will be used for the client to server traffic.
Example:
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.
IPv4 Example:IPv6 Example:
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.
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 valueprovided (limited to 1-255).
Examples:
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 tothe 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
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 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 beused for the server to client traffic and the optional second MAC address will be used for the client to server traffic.
Example:
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 usedfor the server to client traffic and the optional second MAC address will be used for the client to server traffic.
Example:
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. https://bestyup181.weebly.com/iflicks-2-2-6-2.html.
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
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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:
0x0F Unicast
0xBF Broadcast
You can however specify any single byte value.
Set the DLT value of the output pcap file.
See Also
tcpdump(1), tcpprep(1), tcpreplay(1)
Author
Copyright 2000-2010 Aaron Turner
For support please use the tcpreplay-users@lists.sourceforge.net mailing list.
Mac Pcap Viewer Download
The latest version of this software is always available from: http://tcpreplay.synfin.net/
Pcap Viewer Mac
Released under the Free BSD License.
This manual page was AutoGen-erated from the tcprewrite option definitions.
Referenced By
tcpbridge(1),tcpreplay-editMac Pcap Viewer Software
(1)