Enable responses from 2 internet gateways on the same system

Hello
I tried this question in the Tiger Networking forum but didn't get a response so I'm giving it a shot here.
I am hoping one of the network gurus here can help me out. I've spent quite a few hours trawling these forums and others online to try to find the answer to my question, but success has not been forthcoming.
My situation is this. I have a system that functions as a server that is connected to two separate internet connections. The G5 tower is hooked up to each via Ethernet. Each connection has a manually configured connection with a fixed IP. The gateways for each are using different IP ranges, the IP for en0 is 10.0.1.59 and en2's IP is 192.168.1.145. They each have different gateways configured as well, 10.0.1.1 and 192.168.1.1 respectively. 192.168.1.145 is the DMZ system for that internet connection. Here is the default entry in the system's routing table:
Destination Gateway Flags Refs Use Netif Expire
default 10.0.1.1 UGSc 4 8 en0
I need both interfaces to reply to requests to their public IPs backthrough the correct gateway and not the default gateway. This is because of bandwidth constraints and the need to perform nightly backups of substantial amounts of data from our business hour VOIP connection, but allow the existing default gateway to remain first in the network service order list.
I have thus far tried the following based on what I could learn from this and other forums across the Web. I have enabled forwarding with the following command:
sudo sysctl -w net.inet.ip.forwarding=1
Then I have applied a fwd rule to ipfw that purports to route requests made to the en2 local address back through the correct gateway:
sudo ipfw add fwd 192.168.1.1 ip from 192.168.1.145 to not 192.168.1.145 out
However, this does not work and there is no response from the en2 gateway when trying to access the system from that gateway's public IP.
Can anyone see something obvious that I'm missing or point me at an online resource that will let me figure out how to get this working?
Many thanks in advance.

I sounds like what you need is a static route to the IP address of whatever is on the other end of the Retrospect request. The command would look something like this:
sudo route -n add -host host_address -gateway router_address
where host_address is the IP address of whatever the Retrospect request is going to, and router_address is the gateway you want it to go out of.
A caveat here is that the route entry does not survive a reboot, so you'd want to create a startup item, or preferably a launch daemon to do this for you automatically on startup.

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Enable responses from 2 separate internet connections on the same system

Hello List
I am hoping one of the network gurus here can help me out. I've spent quite a few hours trawling these forums and others online to try to find the answer to my question, but success has not been forthcoming.
My situation is this. I have a system that functions as a server that is connected to two separate internet connections. The G5 tower is hooked up to each via Ethernet. Each connection has a manually configured connection with a fixed IP. The gateways for each are using different IP ranges, the IP for en0 is 10.0.1.59 and en2's IP is 192.168.1.145. They each have different gateways configured as well, 10.0.1.1 and 192.168.1.1 respectively. 192.168.1.145 is the DMZ system for that internet connection. Here is the default entry in the system's routing table:
Destination Gateway Flags Refs Use Netif Expire
default 10.0.1.1 UGSc 4 8 en0
I need both interfaces to reply to requests to their public IPs backthrough the correct gateway and not the default gateway. This is because of bandwidth constraints and the need to perform nightly backups of substantial amounts of data from our business hour VOIP connection, but allow the existing default gateway to remain first in the network service order list.
I have thus far tried the following based on what I could learn from this and other forums across the Web. I have enabled forwarding with the following command:
sudo sysctl -w net.inet.ip.forwarding=1
Then I have applied a fwd rule to ipfw that purports to route requests made to the en2 local address back through the correct gateway:
sudo ipfw add fwd 192.168.1.1 ip from 192.168.1.145 to not 192.168.1.145 out
However, this does not work and there is no response from en2 gateway when trying to access the system from that gateway's public IP.
Can anyone see something obvious that I'm missing or point me at an online resource that will let me figure out how to get this working?
Many thanks in advance.

I sounds like what you need is a static route to the IP address of whatever is on the other end of the Retrospect request. The command would look something like this:
sudo route -n add -host host_address -gateway router_address
where host_address is the IP address of whatever the Retrospect request is going to, and router_address is the gateway you want it to go out of.
A caveat here is that the route entry does not survive a reboot, so you'd want to create a startup item, or preferably a launch daemon to do this for you automatically on startup.

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Machine Name:          Power Mac G4
Machine Model:          PowerMac3,5
CPU Type:          PowerPC G4 (2.1)
Number Of CPUs:          1
CPU Speed:          800 MHz
L2 Cache (per CPU):          256 KB
Memory:          768 MB
Bus Speed:          133 MHz
Boot ROM Version:          4.3.3f2
Serial Number:          XBxxxxxMK9
Sales Order Number:
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<Edited By Host>

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Attachments:
Plotting from a text file like a media player example.jpg ‏61 KB

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Enable responses from 2 internet gateways on the same system

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