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- Path: sparky!uunet!mcsun!uknet!axion!spuddy!markl
- From: markl@spuddy.uucp (Mark Liversedge)
- Newsgroups: comp.unix.aix
- Subject: Re: Problem with et0/en0 network devices
- Message-ID: <1992Aug26.083745.2128@spuddy.uucp>
- Date: 26 Aug 92 08:37:45 GMT
- References: <GREENDOG.92Aug21092320@insti.physics.sunysb.edu> <1992Aug24.083533.10981@spuddy.uucp> <1992Aug25.114959.9626@magnus.acs.ohio-state.edu>
- Organization: Spuddy's Public Usenet Domain
- Lines: 31
-
- In article <1992Aug25.114959.9626@magnus.acs.ohio-state.edu> merrick@magnus.acs.ohio-state.edu (Tom Merrick) writes:
- [ ... deleted ...]
- >>I have a 'similar' problem, our small network has three hosts:
- >>
- >>128.127.50.1 druid (RS/6000 320 running AIX 3.1.5)
- >>128.127.50.2 pctcp (PC running FTP PC/TCP)
- >>128.127.50.3 mc550 (RS/6000 550 running AIX 3.2)
- >>
- >>A ping of 128.127.255.255 (the broadcast address) will get responses from druid
- >>and pctcp when started on the 550. But only pctcp responds to one from the 320.
- >>
- >>The RS/6000 550 does not respond to ICMP broadcast echo packets. Why?
- >
- >Make sure that the 550 is not using the et0 interface and the 320 the en0
- >interface. The en0 interface will transmit standard ethernet packets and
- >receive BOTH 802.3 and standard packets. While the et0 interface will only
- >receive and transmit 802.3 packets, ignoring everything else.
- I am using en0 on both RS/6000's, the 550 is receiving the frame (netstat -s
- tells me an ICMP echo packet arrived), it is just choosing not to reply.
-
- In email ejsiebe@chgvmic1.vnet.ibm.com (Eric Siebert) informs me:
- "i believe thie is a result of AIX 3.2's conservative implementation
- of RFC 1122, which allows a host to silently discard ICMP echo
- requests destined for a broadcast address. i believe the justification
- for this is to prevent misuse (which has the potential for creating
- broadcast storms)."
-
- Back to the drawing board for me! :-(
- --
-
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