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
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