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- Path: sparky!uunet!nntp1.radiomail.net!cronos!Metaphor.COM!polk
- From: polk@Metaphor.COM (Ben Polk)
- Newsgroups: comp.unix.aix
- Subject: Re: telnetd dies mysteriously... why?
- Message-ID: <2688@cronos.metaphor.com>
- Date: 14 Dec 92 20:47:12 GMT
- References: <1992Nov29.070352.27467@ncsu.edu> <1992Nov29.185139.8510@ncsu.edu>
- Sender: news@cronos.metaphor.com
- Reply-To: polk@Metaphor.COM (Ben Polk)
- Organization: m4
- Lines: 50
-
- In article <1992Nov29.185139.8510@ncsu.edu>, nsysdbj@acs.ncsu.edu (David Joyner) writes:
- |> James M Manning (jmmannin@eos.ncsu.edu) wrote:
- |> :
- |> : Machine info:
- |> : RISC 6000, AIX 3.2.2
- |> :
- |> : I'll be telnet-ing to my rs6k, and happily going along, and boom!
- |> : in the middle of something normal (it's never been the same thing
- |> : twice, and doesn't seem to matter), my connection dies.
- |> : the rs6k no longer responds to pings, and telnet and ftp and both
- |> : fail to connect, of course. The weird part is that it will come back
- |> : up later, usually it's up by the next day. It has been suggested
- |> : that crontab could be doing it, but all I've got in there
- |> : is a once-a-week backup, and I assure myself that's not it.
- |> :
- |> : TIA,
- |> : James Manning
- |>
- |> RS/6000's running AIX 3.2 and probably AIX 3.1.x have a nasty bug that
- |> causes TCP/IP to break when they're on a source routed token ring
- |> network with a Cisco router (yours is). The Cisco broadcasts XID
- |> polls to the NULL DSAP on the RS/6000 which it blissfully ignores.
- |> The result is that the Cisco cannot route packets to the 6000. If
- |> there is no traffic originating from the 6000 through the Cisco,
- |> outside connections will fail as soon as the route info in the Cisco
- |> times out.
- |>
- |> There is a fix for this if you dare, it is IX25227. They will send it
- |> to you along with 19 pages of prereq fixes that break xdm among other
- |> things.
-
- Another way to fix this is to staticly configure the Token-Ring source
- route into the cisco machine.
-
- Or have the RS/6000 "ping" the cisco every minute or two. The cisco
- will find the source route information contained in the SAP 0xAA packets
- sent by "ping". I haven't tried this myself, but it should work. If
- you have a router that doesn't allow static source route configuration,
- this might be your only alternative.
-
- Also, if you have a token ring that doesn't have any bridges in it, be sure
- the source routing stuff in the cisco is turned off.
-
- If there is any justice, someday the people that designed the Token-Ring
- source routing shit will pay for what they did. Put them in the same
- corner of networking hell with the people that created the Ethernet
- slide "lock" connectors.
-
- Ben Polk
- polk@metaphor.com
-