On Tue, 19 Mar 1996, Jukka Marin wrote:

> Mar 19 08:23:41 muikku pppd[23397]: remote IP address 193.185.236.55
> Mar 19 08:23:41 muikku pppd[23397]: ioctl(SIOCAIFADDR): Address already exists
> Mar 19 08:23:41 muikku pppd[23397]: add proxy arp entry: File exists

This is a nasty problem that has haunted us for a while now.  My 
workaround is to publish permanent arp entries for all IPs that I do 
proxy for, at boot time (I hacked /etc/netstart to do this).

Ugly, but it does the job.

--scott