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- Newsgroups: comp.unix.aix
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!gatech!usenet.ins.cwru.edu!agate!linus!philabs!trintex!elr
- From: elr@trintex.uucp (Ed Ravin)
- Subject: Weird Ping Problem -- Hide 'n' Seek?
- Message-ID: <1992Dec21.225309.28390@trintex.uucp>
- Summary: he can see me but I can't see him unless he sees me first. ICMP?
- Keywords: tcp ping
- Organization: Prodigy Services Co.
- Date: Mon, 21 Dec 1992 22:53:09 GMT
- Lines: 31
-
- I've got the strangest problem trying to communicate between two RS/6000's.
- They're networked to each other via token ring and a couple of bridges.
-
- Let's call these two machines A and B. Everything was wonderful until one
- day, some connections and configurations were moved around. I signed on to
- machine A and tried to ping machine B. No response. I called up the admin
- of machine B on the phone. He said, "Let me try pinging you..." He signs on
- to machine B and pings me. It works fine. I then go back to machine A
- and try pinging B again. Much to my amazement, now it works, but after several
- minutes (haven't nailed down the exact length of time it takes) if I don't
- reference machine B in any way, it fails again.
-
- The admin from B was skeptical, so I came down to his machine and started up
- two X windows. The first one I left at the regular command prompt, and the
- second one I telnetted to machine A, but via two indirect hops so as not to
- create a direct path between B and A. From that window, I said "ping B", and
- it hung there, timing out. I then switched to the local window on B, with
- the sysop watching, and said "ping A". Immediately, both windows began
- scrolling with successful pings.
-
- Anyone out there have some ideas? The folks in charge of the token ring
- bridges claim everything works, and that traffic should pass equally in
- both directions. I've looked through B's routing tables, but I can't find
- anything that explains why locally originated pings would work while remote
- ones go unanswered...
-
- --
- Ed Ravin- elr@trintex.uucp| I like to think (and the sooner the better!)
- elr%trintex@uunet.uu.net| Of a cybernetic meadow where mammals and computers
- +1-914-993-4737| Live together in mutually programming harmony
- my opinions, nobody else's| Like pure water touching clear sky. -R. Brautigan
-