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Destination or SOurce NAT setup for Mgmnt of 2WIRE modem

Here is my setup:

2 internet connections on ETH1 & ETH3 of an ASG120
a 2WIRE DSL Modem on ETH3
Cable Modem on ETH1
I can access the Astaro right now only vie the cable connection on eth1

The 2WIRE DSL modem is doing the PPPoE connection and is setup to do a Public Proxy NAT translation to one of 5 static public IP's to eth3 on the Astaro.

The eth3 interface is connected to the 2WIRE modem and is set to Cable (DHCP) mode MTU1492 and being statically assigned a public IP address from our IP pool through the 2WIRE modem .  The modem is doing Public Proxy in NAT mode to the between the Astaro and the public IP address through a reservation matched to the MAC address of eth3 in the Public Proxy NAT setup.  The Astaro eth3 is being assigned ONLY the public IP address and not a 192.168.1.x address.

I am having problems with the setup so I would like to access the 2WIRE management interface but can't unless I am connected directly to the DSL modem internally using a 192.168.1.0 address talking to the modem at 192.168.1.254.

The Astaro eth3 address is assigned a public IP address due to the MAC reservation in the DSL modem.  I would like to change the MAC address on eth3 so I can then have eth3 pull a 192.168 address from the DSL modem then do a Destination or Source NAT rule to access the interface on the DSL modem.

How would I do a DNAT/SNAT setup to access the interface of the DSL modem?  I would be coming in on eth1:8888 and want to map the traffic to http port 80 out eth3 to 192.168.1.254 but appearing to come from a 192.168.1.x address.

I am not sure if this is even possible because the DSL modem may not honor any traffic appearing to come from the mac address assigned the Public IP Nat as a 192.168.1.x source.  If this is the case I thought that if I could change the MAC address on the Astaro eth3, I could pull a 192.168.1.x IP address then use the DNAT/SNAT rule to access the interface. How do I modify the MAC address on an interface on the Astaro?

I really don't want to have to go back on-site because it is a long trip.

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0 BarryG over 14 years ago

And bridging the modems is out of the question?

Barry
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0 BrucekConvergent over 14 years ago in reply to BarryG

Bridging the DSL Modem will make this a lot simpler... for the interested: Bridging the 2wire and PPPoE (Disabling Router) 2 Wire - dslreports.com

CTO, Convergent Information Security Solutions, LLC

https://www.convergesecurity.com

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Advice given as posted on this forum does not construe a support relationship or other relationship with Convergent Information Security Solutions, LLC or its subsidiaries. Use the advice given at your own risk.
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0 skydiver over 14 years ago in reply to BrucekConvergent

If I bridge the modem it makes management of the modem impossible unless I cart out a PC to plug into the modem's Ethernet port to be able to access the 192.168.1.0 network to get to the modems address (it ONLY allows management on the devices unchangeable 192.168.1.254 address)
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0 skydiver over 14 years ago in reply to BrucekConvergent

If I bridge the modem it makes management of the modem impossible unless I cart out a PC to plug into the modem's Ethernet port to be able to access the 192.168.1.0 network to get to the modems address (it ONLY allows management on the devices unchangeable 192.168.1.254 address)
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