![]() ![]() ![]() This means that the original packet was encapsulated in a new packet, with a new IP header added on top. If you see a packet that has two IP headers, it's likely that the packet has been tunneled or quoted. When troubleshooting network issues, it's important to be able to read a PCAP and understand what's going on. This can be confusing for people who are trying to read a PCAP, because they might not expect to see a header twice in the same packet. Packets can get a lot more complex, including repeating the same protocol twice (tunneling) or repeating the same protocol field twice within the same packet layer. Not every packet in a PCAP is just a simple Ethernet / IPv4 / TCP packet. Matching a specific layer in the protocol stack That's where these enhancements make your filtering job easier. Appear more than once in a single packet.Quote other protocols in a reply (ICMP).Tunnel the same protocols multiple times (IP-in-IP).Why does this matter? Well, maybe you deal with protocols that: ![]() The filter expression limitation has been an issue on the Wireshark bug tracker for a long time - 13 years: Filter expression syntax needs to handle tunneling better. In packets that contain the same protocol more than once, it was previously impossible to distinguish between these protocols using a display filter. If you analyze network protocols like IPv4, ICMP, IPv6, ICMPv6, TLS, and GRE, this article is for you. ![]()
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