Whenever we have weird network problems, the first thing our networks people do is check the bad packet counters on the machines involved. It annoys me slightly

Whenever we have weird network problems, the first thing our networks people do is check the bad packet counters on the machines involved. It annoys me slightly, because the problem is never related to packet corruption. But ... > A Montreal machine receiving this packet discarded it at the kernel level after realizing it’s corrupt, never passing it to the userland ssh daemon. London then re-transmitted it, going through the same corruption, getting the same silent treatment. From ssh and sshd’s perspective, the connection was at a stalemate. From tcpdump’s perspective, there was no loss, and Montreal machines appeared to be just ignoring data. ... it would have caught this! I suppose it's a good habit, because it's a cheap check for something that would be absolutely baffling otherwise.