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Oh man, this reminds me of troubleshooting a host behind a router that didn't support window scaling. It took a week or two to figure out why we couldn't trans
by fleitz 12y ago
Oh man, this reminds me of troubleshooting a host behind a router that didn't support window scaling.
It took a week or two to figure out why we couldn't transfer data but could connect, ssh, ping, etc.
- donavanm 12y agoBroken TCP window scaling? The connection should still work, with the sender backing off right? If you mean busted PMTUD yeah thats awesome when the handshake and GET works, but you cant get data back.
- ak217 12y agoWe saw busted PMTUD on a customer's network trying to get to us via a misconfigured network link. It's a bad problem to debug. None of us knew what PMTUD was, or that TCP can require ICMP to work, until that day.