Truncated IP??? What?

slaken · 05-11-2004, 05:13 PM

Anybody who can explain what is happening with my IP packets (or TCP)? Here is some code from tcpdump:

Code:

11:16:51.345418 IP truncated-ip - 930 bytes missing! 216.239.59.104.http > 192.168.0.101.32966: . 1:1431(1430) ack 330 win 31460

This happens as I try to browse www.google.fi, but nothing shows up and tcpdump just gives info about some missing bytes.

Is there anyone who can explain this? Thanks!

chort · 05-11-2004, 06:24 PM

All the other references to this I found on Google indicate that is a problem with PPP or PPPoE. Possibly the MTU of the site sending you data is too large and it's being truncated by your hardware.

slaken · 05-12-2004, 01:45 AM

Tried to look for an explanation using Google, but I have not yet found what I am looking for. Well, I thought of the MTU myself, so I have been trying to lower it, but no difference. The HW I am using is a laptop with a DWL-650+ (wireless PCMCIA card) and a D-Link AP (think it is something-614+) connected to the Internet. No browsing works at all; I cannot even access the AP's user interface (an HTML page). Everthing results in the above error/problem. BTW, ping is working to anywhere.

chort · 05-12-2004, 01:49 AM

No, not the MTU on your side, the MTU on the sending side (i.e. the equipment sending the packet to you).

Oh wait, no web browsing works--I thought it was just that one site in particular?

slaken · 05-12-2004, 03:22 AM

No web-browsing works, but as I said I can ping any machine on the Internet.

slaken · 05-12-2004, 03:51 AM

Problem solved. My AP was configured to fragment the datagrams to a too small length.