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For the last couple of years, I captured many different network and upper-layer protocols and published the pcaps along with some information and Wireshark screenshots on this blog. However, it always takes me some time to find the correct pcap when I am searching for a concrete protocol example. There are way too many pcaps out there. This is supposed to change now: I’m publishing a single pcap m
A common misunderstanding of traceroute is that it fully relies on ping. “If I block ping at my firewall, no one can use traceroute to reveal my internal routing path”. Unfortunately, this is not true. If traceroute is used with TCP SYN packets on permitted TCP/UDP ports, all intermediary firewalls will handle the IP packets with TTL = 0 corresponding to the RFCs and will reply with an ICMP time e
I really love ping! It is easy to use and directly reveals whether the network works or not. Refer to Why Ping is no Security Flaw! (But your Friend) and Advanced Tracerouting. At least outgoing pings (from trust to untrust) should be allowed without any security concerns. However, many companies are denying these ICMP echo-requests from untrust into the DMZ which makes it difficult to test whethe
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