I just got our new 515E into the shop and I've been trying to get it up and running. This is my first experience with PIX, so I've definitely drifted a little deeper in the pool than I've been before.
We have a subnetted class C that we'd like to hold on to, since all the machines are presently configured with it. I'm not interested in NAT and using private addresses behind the PIX since that is the case. I can't seem to get the unit configured, though, in such a way that it let's me access outside from inside.
the pix is not a bridging firewall. you have both your outside and inside interfaces on the same subnet, which will not work. you will likely need to use your legit ip addresses on the outside, and use nat internally.
1. I really don't see why I'd have to change all the hosts inside to a private IP. I don't understand how my situation is different from the example in the documentation that I linked to.
2. I don't really have both my outside and inside interfaces on the same subnet. They both use the same class C, but with a subnet mask of 255.255.255.192 they're on different subnets (inside is on A.B.C.192 and outside on A.B.C.128).
i lost my head, you are right on the ip addressing
edit : don't you want to disable nat?
nat 0 a.b.c.192 woul do identity nat for the inside subnet. this would allow those hosts to avoid nat, and make connections outbound, and thus create xlates. xlates would not be automatically created for outside hosts to initiate commo to inside hosts. to do that, nat 0 access... or a static command would be necessary
Assuming I have the PIX configured properly for untranslated addresses on the inside, when those packets move across the PIX out the outside interface...what would happen to them? They'd be on a different subnet than they originated from, wouldn't they? And without translation, no device configured on the OUTSIDE subnet (including the outer router) would be able to pick up those packets, no?
If this is the case, what good is bypassnig NAT to use public IPs...if they have to be on a different subnet, and one that isn't going to be routed on the other side? Is there something in the router config that picks up those requests and sends them along?
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...