Messages in this thread | | | Date | Sat, 21 Aug 1999 21:00:50 +0200 (NST) | From | Jelle Foks <> | Subject | Re: _Very_ strange network delay over dialup-ISDN in 2.2.11. |
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Hello,
I've found similar ping results too. They went away for me when I set up the MTU to 1500 on both my ippp0 interface and on the ISP configuration web page, so playing with the MTU and MRU might help... That's all I know.
Jelle.
Thu, 19 Aug 1999, David Woodhouse wrote: > Marc@Mutz.com said: > > I just experienced a very wierd network delay: I use a ISDN dialup > > line to my university. Normally I do not run ping, so this is - apart > > from a similar occurence with up to 20 sec lags in 2.2.10 - the first > > time I noticed this behaviour. But this time I wanted to keep the > > connection established. So I fired up ping, and saw that it reported a > > round-trip time of 1 second (1000 ms)! > > it could only be resolved by shutting down the ISDN system (/sbin/ > > init.d/i4l stop) and starting it again. > > Anyone got a clue? > This sounds familiar. I had a similar problem a few months ago. There were > always a constant number of packets in the outgoing queue. If I ran tcpdump on > the ISDN interface, I could see them being sent out. TCP connections would > stall, unless I ran ping across the link to keep the queue moving. ping -f > would make packets go out almost immediately (chronologically speaking). > > I didn't ever manage to find out the cause of the problem. It used to take > some days of connectivity before it would happen, so I couldn't easily debug > it. Eventually we installed a leased line to replace the ISDN, so I have no > clue if it's still happening. > > I was using the CVS ISDN code at the time - the standard code wouldn't work > with the Teles 16.3c IIRC.
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