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Topic review - Sendip packet crafting tool: How to send bad checksum TCP packets
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Post subject: Re: Sendip packet crafting tool: How to send bad checksum TCP packets |  Posted: Wed Apr 15, 2015 2:02 am |
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Ok i understand what you are saying but i think there should be more comments about the topic started initially, Thanks
Ok i understand what you are saying but i think there should be more comments about the topic started initially, Thanks
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| Post subject: Re: Sendip packet crafting tool: How to send bad checksum TCP packets | Posted: Fri Mar 27, 2015 7:40 am |
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will send TCP packets with bad checksum?great
will send TCP packets with bad checksum?great
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| Post subject: Sendip packet crafting tool: How to send bad checksum TCP packets | Posted: Tue Jan 28, 2014 5:52 am |
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Following sendip command will send TCP packets with bad checksum. Code: # sendip -p ipv4 -p tcp -is 10.0.1.2 -iv 4 -ip 6 -ic 2342352 -ts 1000 -td 80 -tc 234235235 172.16.2.2 Following a tcpdump snapshot of the packet: Code: 10:49:53.952912 IP (tos 0x0, ttl 255, id 61754, offset 0, flags [none], proto TCP (6), length 40)
10.0.1.2.1000 > 172.16.2.2: Flags [S], cksum 0x2563 (incorrect -> 0xd933), seq 2806054912, win 65535, length 0 See the incorrect tcp checksum. Following sendip command will send TCP packets with bad checksum.
[code]# sendip -p ipv4 -p tcp -is 10.0.1.2 -iv 4 -ip 6 -ic 2342352 -ts 1000 -td 80 -tc 234235235 172.16.2.2[/code]
Following a tcpdump snapshot of the packet:
[code]10:49:53.952912 IP (tos 0x0, ttl 255, id 61754, offset 0, flags [none], proto TCP (6), length 40)
10.0.1.2.1000 > 172.16.2.2: Flags [S], cksum 0x2563 (incorrect -> 0xd933), seq 2806054912, win 65535, length 0[/code]
See the incorrect tcp checksum.
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