Date: Fri, 23 Nov 2007 23:59:41 +0200 From: "Joel V." <joel@smail.ee> To: <freebsd-hackers@freebsd.org> Subject: Welcome to Hell / Mysterious networking troubles on FreeBSD Message-ID: <000001c82e1c$27909d50$0200a8c0@windsor>
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Hello all, I'm not experiencing this problem, my friend is. He's simply too pissed off to write here and I'm afraid he's going to set his office on fire if he doesn't solve the problem soon, so without further ado, here's the problem: He has two fbsd boxes, main server running 6.1 and dns server running 4.3. He has 4 public IPs which he can use and the main server is running on x.x.x.122. He's main box is NOT acting as a gateway/NAT box in the office. Today he noticed that net is getting awfully slow. Sometimes there would be 50% pl when pinging, sometimes pinging would be all OK, but SSH is dead-slow and the webpages running on the main server are not displaying. E-mails are not going through. He calls the ISP, who say that his network is showing major uploading activity. He switches off networking services one by one in the main box but situation does not improve. He disconnects the main server and puts a windows xp box instead, which seems to run fine. He puts back the freebsd box, disables all networking services again except for SSH and connects the network: instant 100% networking slow-down. He tried to change the switch, thinking it's faulty. He disconnect every other computer in the office from the network: nothing. He put the public IP address on the second, internal network NIC: same thing. Now it gets really mysterious: he puts the old dns server with the x.x.x.122 IP and instantly it becomes slow as death. The logical conclusion would be that someone is flooding that IP? Only the windows xp box seemed to work fine and the ISP guy said it was upload bandwidth that was excessive... Netstat -a doesn't show anything interesting, arp -a doesn't show any incomplete addresses He tried to build and install a new fresh kernel. Nothing. This is the most creepy networking problem I've heard of. Can YOU help? Any ideas where to start looking? I'm not in the freebsd-hackers list, so if you want the e-mail to reach me, send a copy to joel@spirit.ee Thank you in advance! Joel
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