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It would be pointless anyhow, because tcpdump makes it already easy to filter out that kind of info. In the TCP 3-way handshakes, the exchange between hosts goes like this: Source sends SYN 2.
If we want to match packets with only the SYN flag set, the 14th byte would have a binary value of which equals 2 in decimal:. We used a mask here.
By looking at the TCP state machine we can find the different flag combinations we may want to analyze. It means the 3 way handshake has not completed. We may want to analyse that kind of traffic. You can use something like http: If no IP options are set.. Usually, options takes 12 bytes 12th byte indicates the header length, which should report 32 bytes.
The first 4 bytes SSH- have an hex value of 0xD. We may want to filter ICMP messages type 4, these kind of messages are sent in case of congestion of the network. For some reason, we have to filter out with the value in hex. Is DF bit don't fragment set? Matching datagrams with low TTL Exercise: Matching TCP traffic with particular flag combinations: Matching with tcpflags Exercise: Table of contents Introduction Notes Let's start Exercise: Tcpdump advanced filters Original publication: All commands are typed as root.
I'll try to keep this document updated with new useful rules. Let's start Before I begin with advanced filters, let's review the basic syntax of tcpdump.
Basic syntax Filtering hosts Match any traffic involving In an ideal world, every field would fit inside one byte. This is not the case, of course. Are IP options set? Anyhow, we need to divide the first byte in half This is the IP version. This is the number of blocks of 32 bits in the headers. The second half of the first byte would be bigger than 5 if the header had IP options set.
In decimal equals Let's recap how to calculate in decimal. This rule should do the job: That's rather simple, if you want to: Fragmentation info can be found in the 7th and 8th byte of the IP header. The fragment offset field is only used when fragmentation occurs. If we want to match the DF bit don't fragment bit, to avoid IP fragmentation: The 7th byte would have a value of: Matching fragmentation Matching MF more fragment set?
This would match the fragmented datagrams but wouldn't match the last fragment which has the 2nd bit set to 0: Matching the fragments and the last fragments: We don't want datagrams with the DF bit set though..
This can be verified, we're going to try to specify a TTL of