[comp.dcom.sys.cisco] possible solution

rene@geveke.nl (Rene van der Hauw) (04/15/91)

Dear steve

I have been thinking, What is going to happen when instead of specifing
the ip address of the router, I am going to specify the broadcast address
of that subnet. Because I have got two routers, both responding to proxy
ARP, one of them is always going to respond.

So when one router is not working anymore the proxy ARP of the other unit
is going to respond.

Could this be the solution?

Rene van der Hauw

Geveke electronics
Amsterdam
31-20-5675558

"Matt Crawford" <matt@oddjob.uchicago.edu> (04/15/91)

Ack!  Broadcast every non-local packet?  Have both routers respond
when both are up?  I think a far better plan would be, in BSD Unix
terms,

	route add default <my-ip-address> 0

So that every address is arp'ed for.  One or both routers will
reply, and one of the answers will go into the arp-cache.  I don't
know if or how you get the same effect in MSDOS.

The only trouble is that no arp layer I've seen yet will time
out an arp entry while it's being used frequently.  If the router
whose ethernet address you've cached goes down, and you don't
stop trying the same non-local host, the useless arp entry will
remain.