OPTIONS
-r string, --portmap=string (修改端口号)
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 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 (随机改写IP地址)
Randomize src/dst IPv4/v6 addresses w/ given seed. This option may appear up to 1 times. 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 (通过伪NAT重写IP地址)
Rewrite IPv4/v6 addresses using pseudo-NAT. This option may appear up to 2 times. This option must not
appear in combination 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
rewriten 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 (通过伪NAT改写源地址IP)
Rewrite source 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 source IP addresses in the IPv4/v6 header.
-D string, --dstipmap=string (通过伪NAT改写目的地址IP)
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 destination IP addresses in the IPv4/v6 header.
-e string, --endpoints=string (在最后两个点之间改写IP地址)
Rewrite IP addresses to be between two endpoints. This option may appear up to 1 times. This option
must appear in combination 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]
-b, --skipbroadcast (不重写广播和多播地址)
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 (强制重新计算包头checksum)
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 (指定MTU)
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 maximum padding length (--fixlen=pad) or
when truncating (--mtu-trunc).
--mtu-trunc (大于指定MTU报文被截断)
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 (删除以太网最后一帧的校验和(删除最后 2 个字节))
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 packets.
--ttl=string (修改TTL值)
Modify the IPv4/v6 TTL/Hop Limit.
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).
Examples:
--ttl=10
--ttl=+7
--ttl=-64
--tos=number (修改TOS值)
Set the IPv4 TOS/DiffServ/ECN 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 TOS (also known as DiffServ/ECN) value in IPv4.
--tclass=number (修改tcalss值,主要用在ipv6)
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 (修改IPv6 Flow Label)
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用0填充pad的值,使满足报文包头的lenth的值,=del只留包头删除pad,主要用于抓的报文只抓了包头没有抓数据部分)
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
--skipl2broadcast (跳过重写2层的mac地址,和广播包的mac地址)
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 broadcast/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 following 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 (重新目的mac地址 --enet-dmac=server_mac,client_mac)
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 (重新源mac地址 --enet-smac=server_mac,client_mac)
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-vlan=string (=add 增加vlan tag, =del 去掉vlan tag)
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 ethernet header
--enet-vlan-tag=number (修改vlan tag)
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 constrained to being:
in the range 0 through 4095
--enet-vlan-cfi=number (修改vlan cfi)
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 constrained to being:
in the range 0 through 1
--enet-vlan-pri=number (修改vlan priority)
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 constrained to being:
in the range 0 through 7
--hdlc-control=number (将Ethernet协议头转成Cisco HDLC)
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 verbosity level for debugging output. Higher
numbers increase verbosity.
-i string, --infile=string (输入要重写的文件名)
Input pcap file to be processed. This option may appear up to 1 times.
-o string, --outfile=string (输出重写完成的文件名)
Output pcap file. This option may appear up to 1 times.
-c string, --cachefile=string (输入cache文件名)
Split traffic via tcpprep cache file. This option may appear up to 1 times.
Use tcpprep cache file to split traffic based upon client/server relationships.
-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 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.
--fragroute=string
Parse fragroute configuration file. This option may appear up to 1 times.
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.
--fragdir=string
Which flows to apply fragroute to: c2s, s2c, both. This option may appear up to 1 times. This option
must appear in combination with the following options: cachefile.
Apply the fragroute engine to packets going c2s, s2c or both when using a cache file.
--skip-soft-errors
Skip writing packets with soft errors. This option may appear up to 1 times.
In some cases, packets can not 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.
-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 configuration file listed in the OPTION PRE-
SETS 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.