brian@ucsd.EDU (Brian Kantor) (02/05/88)
A few weeks ago I mentioned here that we're having a problem with the Milnet IMP we're connected to being completely unable to open X.25 virtual circuits to us, so only those VCs that we open to it will allow data to pass to mailbridges and other hosts on the milnet. We're still having the problem, and I wonder if anyone else has seen this happening on their host? Misery loves company, maybe? Our interface is an ACC6250 board (in a VAX780 4.3BSD), and the people at ACC (especially Lars Poulson) have been extremely helpful in attempting to get this problem resolved, but so far it isn't. I'm told that a trace in the PSN code shows that the IMP wasn't even trying to open the circuit to us, so it's probably in or related to the PSN code and not the interface - especially since it just started happening without us making and hardware or software changes. It DID start around the time the Arpanet cut over to PSN-7, but we're on the Milnet. We're currently running a process that sends a single ping packet to each of the Milnet mailbridges once every 45 seconds to ensure that the X.25 VC stays open so that traffic will find an already-open VC instead of blocking because it can't open one of its own. Now that I've finished crying on your collective shoulders (waah), I'm wondering if anyone else has seen any evidence of this happening to them? I have trouble believing we've been singled out for this dubious honor. Brian Kantor UCSD Office of Academic Computing Academic Network Operations Group UCSD B-028, La Jolla, CA 92093 USA brian@ucsd.edu ucsd!brian BRIAN@UCSD
jtn@potomac.ads.com (John T. Nelson) (02/12/88)
In article <7@ucsd.EDU>, brian@ucsd.EDU (Brian Kantor) writes: > > I'm told that a trace in the PSN code shows that the IMP wasn't even > trying to open the circuit to us, so it's probably in or related to the > PSN code and not the interface - especially since it just started > happening without us making and hardware or software changes. It DID > start around the time the Arpanet cut over to PSN-7, but we're on the > Milnet. > > We're currently running a process that sends a single ping packet to > each of the Milnet mailbridges once every 45 seconds to ensure that the > X.25 VC stays open so that traffic will find an already-open VC instead of > blocking because it can't open one of its own. Well aside from you being on the Milnet this sounds just like our experiences. However we have a Sun III/180 running 3.4 of their operating system with the Sun X.25 DDN software and an SCP board. Our PSN is running 7.0 and we talk to it only via HDH (although we are configured to talk via X.25 "extended"). I run a ping on a host that we peer with every second. We are still talking to BBN about these problems. -- John T. Nelson UUCP: sun!sundc!potomac!jtn Advanced Decision Systems Internet: jtn@potomac.ads.com 1500 Wilson Blvd #512; Arlington, VA 22209-2401 (703) 243-1611 "Hi... My name is Hobbes. I'm the product of a malicious 5-year old's twisted and destructive imagination. Would YOU like to be my friend?"