On Mon, Mar 19, 2007 at 01:40:02PM +0100, Walter Doerr wrote: > Hello, > > I am using an OpenBSD 4.0 box connected to a 2Mbit SDSL line in > Germany (using user space PPP). > > When pinging a host across the SDSL line, I get an occasional > "sendto: No buffer space available" message: > > > 64 bytes from xxx.xxx.xxx.xxx: icmp_seq=566 ttl=254 time=62.674 ms > 64 bytes from xxx.xxx.xxx.xxx: icmp_seq=568 ttl=254 time=38.090 ms > ping: sendto: No buffer space available > ping: wrote xxx.xxx.xx 64 chars, ret=-1 > 64 bytes from xxx.xxx.xxx.xxx: icmp_seq=569 ttl=254 time=1320.651 ms > 64 bytes from xxx.xxx.xxx.xxx: icmp_seq=571 ttl=254 time=35.792 ms
That happens to me when I use ppp for VPN in conjunction with pptp. If the VPN server cannot be reached for a while, e.g. because the link the VPN tunnel runs on top of is suddenly brought down, ppp will continue to buffer packets until its buffer is full. Then I see that message when I try to send more packets. > Does this message point to a problem within OpenBSD or is this a > problem with the SDSL line? No clue. You could enable very verbose logging (set log All) and see if you find some indication in the logs. If you use pppoe for your SDSL, you might want to give pppoe(4) a try. It's in-kernel and has less overhead because it does not context switch as much as user-ppp. -- stefan http://stsp.in-berlin.de PGP Key: 0xF59D25F0 [demime 1.01d removed an attachment of type application/pgp-signature]
