Re: bin/44032: pppd: proxyarp is not working

[Egerváry Gergely <gergely%egervary.hu@localhost>]

The following reply was made to PR bin/44032; it has been noted by GNATS.

From: =?UTF-8?B?RWdlcnbDoXJ5IEdlcmdlbHk=?= <gergely%egervary.hu@localhost>
To: Christos Zoulas <christos%zoulas.com@localhost>
Cc: gnats-bugs%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost, 
 netbsd-bugs%netbsd.org@localhost
Subject: Re: bin/44032: pppd: proxyarp is not working
Date: Wed, 05 Jun 2013 17:27:20 +0200

 > Test #1: non existent IP address
 > 
 > # arp -s 10.11.12.13 2c:27:d7:14:54:17 pub proxy
 > # arp 10.11.12.13
 > ? (10.11.12.13) at 2c:27:d7:14:54:17 on vlan10 permanent published
 > (proxy only)
 > # arp -d 10.11.12.13
 > 
 > All is good.
 > 
 > Test #2: IP address of a ppp link (local endpoint)
 > 
 > # arp -s 10.0.0.192 2c:27:d7:14:54:17 pub proxy
 > # arp 10.0.0.192
 > arp: 10.0.0.192 (10.0.0.192) -- no entry
 > # arp -d 10.0.0.192
 > arp: delete: can't locate 10.0.0.192
 > 
 > It fails, but "something" is in the arp table. If I try to re-add the
 > entry:
 > 
 > # arp -s 10.0.0.192 2c:27:d7:14:54:17 pub proxy
 > arp: set: proxy entry exists for non 802 device
 
 Now running on NetBSD 6.1, and still no good :(
 
 For testing purposes, now I call pppd with "noproxyarp" option, and try
 to set up ARP entries manually.
 
 1.) If I add the ARP entry manually _before_ connecting the ppp
 connection, the ARP entry looks good, and it pings as expected:
 
 # arp 10.0.0.192
 arp: 10.0.0.192 (10.0.0.192) -- no entry
 # arp -s 10.0.0.192 2c:27:d7:14:54:17 pub proxy
 # arp 10.0.0.192
 ? (10.0.0.192) at 2c:27:d7:14:54:17 on vlan10 permanent published (proxy
 only)
 
 2.) When I add the ARP entry manually _after_ connecting the ppp
 connection, a "zombie" ARP entry is created:
 
 # arp 10.0.0.192
 arp: 10.0.0.192 (10.0.0.192) -- no entry
 # arp -s 10.0.0.192 2c:27:d7:14:54:17 pub proxy
 # arp 10.0.0.192
 arp: 10.0.0.192 (10.0.0.192) -- no entry
 # arp -s 10.0.0.192 2c:27:d7:14:54:17 pub proxy
 arp: set: proxy entry exists for non 802 device
 # arp -d 10.0.0.192
 arp: delete: can't locate 10.0.0.192
 
 Please, help me fix this one. I'm a network administrator not a
 developer, my C knowledge is less than required :(
 
 Thank you.
 -- 
 Egerváry Gergely
 <gergely%egervary.hu@localhost>