Date: Mon, 10 Oct 2005 14:32:16 +0400 From: Gleb Smirnoff <glebius@FreeBSD.org> To: Iasen Kostov <tbyte@otel.net> Cc: freebsd-net@FreeBSD.org Subject: Re: Proxy arp should only replay on specified interface. Message-ID: <20051010103216.GP14542@cell.sick.ru> In-Reply-To: <1128697135.71975.24.camel@DraGoN.OTEL.net> References: <1128697135.71975.24.camel@DraGoN.OTEL.net>
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Iasen, On Fri, Oct 07, 2005 at 05:58:55PM +0300, Iasen Kostov wrote: I> IMHO proxy arp should only replay on specified interface not on every I> arp capable interface which recieved request for the proxied address. I> If lets say host A have arp capable if0 and if1 interfaces and U set: I> route add -host 1.0.0.2 -iface if1 -proxy I> I> and then a request is recieved on if0 for 1.0.0.2, host A will replay I> that it has it (which IMHO is wrong as the proxy route is set for if1). I> I> This sometimes is a big problem for our PPPoE/VPN server when the I> client uses linux or some small routers (e.g Linksys or something) I> probably linux based. It happen that sometimes (when the link is down or I> god knows why) it broadcasts arp "who-has" and the gateway replays. Then I> this host try to use ethernet path and not the (right) tunnel path until I> arp cache expires (which is not real fun as there is firewall rules I> blocking ethernet path :)). I> I> And even worse :) - I can think of ways to bypass routing protocols I> using proxy-arp routes like the one mentioned above. But it will not I> work if proxy-arp behaves the way it does now. I> And 1 thing more - there could be a switch which restores (or turns on) I> old behavior. I> I> (patch agains 5.4-STABLE is attached) Isn't this what you need? http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/if_ether.c?rev=1.140&content-type=text/x-cvsweb-markup -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE
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