Date: Fri, 26 Feb 1999 10:17:24 -0600 (CST) From: Mike Jenkins <mjenkins@carp.gbr.epa.gov> To: david@compusyssolutions.com Cc: freebsd-net@freebsd.org Subject: Re: ARP is not my friend. Message-ID: <199902261617.KAA01232@carp.gbr.epa.gov> In-Reply-To: <36D60E13.2BE08018@compusyssolutions.com>
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> down in th the states. I am on "the wave" - cable modem up in Canada. Ah ha. The cable side looks like an ethernet and people have machines with private IP addresses that match your internal ones and it is confusing FreeBSD. You might try hardcoding your ARP table (at boot time?) with the arp command (man 8 arp). > In the O'reilly book TCP/IP Network Admin. book by Craig Hunt, there is some > discussion about ARP_PROXYALL options in > the basic BSD kernel config. ...on page 114 "Proxy ARP is a variant on the FreeBSD supports this if you have arpproxy_all="YES" in /etc/rc.conf at boot time which /etc/rc.network uses to "sysctl -w net.link.ether.inet.proxyall=1". I doubt that you have this on but you might check. If it is on, turn it off otherwise you'll cause problems for folks on the cable side. They'll ARP looking for 192.168.0.X and your host will answer. > I am not sure I understand all that but this is the only reference I found Proxy ARP helps hosts reach other hosts that they think are on the same ethernet but are really behind a router. I believe it was created because some older hosts didn't understand subnet masks. People split their single ethernet into multiple ethernets separated by a router and using IP subnets. The old hosts couldn't reach the other subnets because they thought everyone was on one ethernet. Thus Proxy ARP was born. A good reference on Proxy ARP and more is "Introduction to Administration of an Internet-based Local Network" by Charles L. Hedrick. It can be found at ftp://athos.rutgers.edu/runet/tcp-ip-admin.doc. Mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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