![]() ![]() The pcap-filter man page includes a comprehensive capture filter reference ( addr_family will either be "ip" or "ip6") Further Informationįiltering while capturing from the Wireshark User’s Guide Not (tcp port srcport and addr_family host srchost and tcp port dstport) Not (tcp port srcport and addr_family host srchost and tcp port dstport and addr_family host dsthost) It does this by checking environment variables in the following order: via SSH or Remote Desktop), and if so sets a default capture filter that should block out the remote session traffic. Wireshark tries to determine if it’s running remotely (e.g. dst port 135 or dst port 445 or dst port 1433 and tcp & (tcp-syn) != 0 and tcp & (tcp-ack) = 0 and src net 192.168.0.0/24 Default Capture Filters Please change the network filter to reflect your own network. This filter is independent of the specific worm instead it looks for SYN packets originating from a local network on those specific ports. Many worms try to spread by contacting other hosts on ports 135, 445, or 1433. ![]() It is the signature of the welchia worm just before it tries to compromise a system. The filter looks for an icmp echo request that is 92 bytes long and has an icmp payload that begins with 4 bytes of A’s (hex).
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