New Zealand ADSL Mailing List


DSL Nat Question

From: Pete <speed_at_advcomm.co.nz>
Date: Mon, 13 Nov 2000 09:07:01 +1300 (NZDT)
Message-ID: <Pine.LNX.4.05.10011130901001.10128-100000@wilma.advcomm>

Hiyas

I'm wondering if it is possible to convince the M11 that it shouldn't do NAT on
certin outgoing packets. Reason being this:

I've got Ultra, which uses an always on static-ip number for the downlink.

I've got a normal dial-up connection to NetAccess (ChCh based ISP).

I've tried sending an ICMP ping out through NetAccess with the source address
set as the static IP I get through IHUG. The packet was passed through by
NetAccess (something I gather they shouldn't allow doing, but hey according to
netscan.org their networks are open for smurf amplification anwyay - so god
knows what other loopholes they have open).

I received the reply to the ping back on my ULTRA box just fine. This probabally
means that I could use NetAccess for my uplink and avoid using any hours on my
Ultra connection at all - but thats a different story.

What I am wondering is can I use my DSL line to send the outgoing packets for
Ultra. This would give me a nice fast uplink!

Problem is of course when I send packets out through the M11 with that source
address they are NAT'd into the real-world PPP address of the M11 and therefore
replies come back in on DSL rather than the Ultra :(

Anyone know any tricks to switch NAT off on an M11 for a certian IP ?

Rgds,
Pete

Pete Mundy - Technician
Advanced Communications
+64-3-546-9169 / +64-25-480-840
E-Mail: Pete@AdvComm.Co.NZ

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Received on Mon Nov 13 09:07:23 2000


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