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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