Hi,

        the Catalyst wouldn't require an ARP cache unless its routeing.
I'd suspect the ARP cache on the 1750.  I believe (can't remember
exactly) that they have something like a 4 hour timeout on each entry.
Clear this cache (or restart it) and you'll probably be OK.

HTH,


                                Neil.


In message <43789E89 dot 5020605 at unr dot edu dot ar>, Claudio Castro
<ccastro at unr dot edu dot ar> writes
>Helllo guys, this was my "before" topology:
>
>Internet----CISCO 1750-----Cisco Catalyst (VLANS)------HUB------Mail
>Server(public)
>                                                     And this is the
>"after" topology:
>
>Internet----CISCO 1750-----Cisco Catalyst ((VLANS)-------m0n0wall------
>-Mail Server(private)
>
>As you can see, now I have a private IP for my mail server, I have a
>1:1 NAT ruel, so I had to define a proxy ARP in the WAN interface of
>m0n0 in order to work.
>But...this isnt working!...UNLESS I spoof the MAC of the mail server in
>the WAN interface of m0n0wall.
>The Cisco, doesnt have a static ARP table or nothing similar...so I'm
>loss.....I hope you can figure out or comment some common problem that
>maybe I forgot to check.
>
>Thanks a lot.
>
>
>
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-- 
Neil A. Hillard                E-Mail:   m0n0 at dana dot org dot uk