Date: Thu, 14 Dec 2000 11:48:43 +0100 From: Udo Erdelhoff <ue@nathan.ruhr.de> To: freebsd-net@freebsd.org Subject: Strange fragmentation needed message Message-ID: <20001214114843.A85041@nathan.ruhr.de>
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Hi, I've been experiencing problems with TCP connections. The symptoms are: - I can't upload large (>5 KByte) files with ftp, the client reports "stalled" at file position 19456; the server receives only the first 1024 Bytes of the file. Downloads work just fine. - Sending mail (uucp-over-ip) takes a long time. uucico complains about a timeout, closes the connection, calls again and restarts after 1024 bytes (2048 for the third connection, etc). - cvsup fails with Establishing multiplexed-mode data connection Running Detailer failed: Network read failure: Connection timed out Will retry at ... Aborting and restarting cvsup will eventually result in a successfull run. The box runs -current (PRE_SMPNG), the connection to the outside is an ADSL line (768/128). I'm using ppp with the assorted netgraph modules and ipfw&natd for NAT. Using ppp -nat instead doesn't help. I've had to ignore the problems for some time due to RL. I've tried to analyse the network traffic and found the following messages with tcpdump -ni tun0 11:36:33.213801 212.185.239.152 > 212.185.239.152: icmp: 212.185.239.152 unreachable - need to frag (mtu 1480) 212.185.239.152 being *my* IP-address. I don't understand what's going on. Traffic for my machine shouldn't be routed into the tunnel (i.e. ppp should add a route to 127.0.0.1 for $MYADDR). And I don't understand the reason for them, either. What's going on? /s/Udo -- >Every program evolves until it is capable of sending email. Except Microsoft Exchange To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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