I am cross-posting this in routing because I didn't really know how this fits in. Here is my situation. We have a small /25 statically routed to us via our current ISP. They host the gateway address for us, so on my SRX1400 I have a simple static default route to this IP.
Now we are bringing in an ARIN block for various reasons. We purchased MX104's so we could peer from multiple ISP's. On MX's interface that faces the SRX, the MX hosts a default gateway IP out of our ARIN block and the SRX has an IP in the same subnet. Like this:
Ok, so now what I have on the SRX is the following.
Interface A has an address 174.x.y.140 with a static default gateway set to the ISP IP of 174.x.y.129
Interface B has an address 198.x.y.5 and an available next hop of the IP on the MX of 198.x.y.1
How do I start using the 198.x.y.0/24 subnet so that traffic destined for that subnet shows up correctly and then responses go back out the correct gateway? And vice versa on the 174.x.y./25 subnet?
All the articles I am finding on this topic is about ISP failover and stuff.
Make Sense?