Subject: Re: network hang
To: None <email@example.com (Brain fried. Explanation is in>
From: Jon Buller <firstname.lastname@example.org>
Date: 09/13/1997 21:17:04
I *think* this happened to my pc532 once as well... It wasn't too
long ago, I was doing a BIG ftp transfer over a 14.4Kbps modem,
and the pc532 acts as a gateway for a SPARCStation ELC and sometimes
a Mac. I wasn't using the ELC in any way (like I could get less
than a 1 min response under those conditions.) Anyway, GTE is really
bad around here, and can only hand out lines good enough to keep the
modem connected for several hours at best. I thought the line had dropped,
but when I got home, the modem was still alive and kicking!
> AHA! I'm NOT the only one!
> Wailer sez:
> * > I'm using netbsd as a gateway/workstation. P133/32 with scsi disks.
> * > I'm having an issue which I've seen off and on for a very long time
> * > in which the network just clogs up and ceases to move. I run ppp over
> * > a v.34 modem attached to a 16550. Lockups appear to occur with
> * > heavy network use, but not always. This last one happened while a
> * > client was running cu-seeme, so heavy udp use.
> Jukka Marin sez:
> /* So your PPP links locks up and starts working only after a modem disconnect
> * and redial? I see this every now and then on all my NetBSD 1.2 boxes. I
> * was hoping this problem had been solved by the com driver changes in
> * -current. I thought there was a handshake problem in the com driver which
> * sometimes prevented data transmission.. but maybe it's not that, then. I
> * haven't used an RS tester to see the state of the handshake signals but
> * I guess I should do that sometime. My PPP link usually stays up for a few
> * days in a row, but on a 486 system we see the problem a few times a day.
> I don't think it's com specific, though -- I'm using a SPARCstation IPX
> [I've just been back and forth a little bit with this on port-sparc; no
> further info just yet...] and I have the exact same problem!
> I experience such anomalies as:
> 'ftp get' works ok to a point (most of a large (1.3MB) file), and
> then kind of bellies up, eventually timing out with Connection reset.
> 'ftp reget' gets about 12-13kB more and does the above.
> Speed: 19200 (38400 gives "zs0a: fifo overrun"), USRobotics Sportster 28.8
> with compression enabled; pppd with deflate 15/bsdcomp 15, no vj compression
> (since that broke on me once). Oh well.
> * The problem only affects one PPP link at a time, so I don't think it's
> * a generic networking problem (Ethernet always works just fine).
> * -jm
> No, but it's certainly not restricted to com*.
> Humanocentric religions and ways of life have proven to be our undoing.