Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

PIX: does it route packets on the inside interfece

I have a PIX with 2 interfaces: "inside" and "outside". I have no problem when a packet coming from a "inside net" PC (C) has to go outside. But if I have to reach an other network that is "inside" (192.168.0.0), it doesn't work; let's see the scheme below:

A

|

---192.168.0.0/24---

|

B C

| |

---172.31.0.0/16 (inside)---

|

PIX

|

----(outside)---

|

R----> Internet

---------------------------------------

I need to reach A from C (PIX is the default gateway of C and it has a specific route to A passing through B)

The question is: does the PIX route packets coming from inside to an other gateway that is on the same (inside) interface?

3 REPLIES
New Member

Re: PIX: does it route packets on the inside interfece

No. The pix will not forward packets back out the interface it recieved them on. So even if you put a static route on the pix pointing back to the subnet A, the pix will drop the packets.

~rls

Silver

Re: PIX: does it route packets on the inside interfece

Assuming you have a router at B to get to A, you need make make that router B the default gateway of the C subnet.

New Member

Re: PIX: does it route packets on the inside interfece

The problem with making B your defualt-gateway is those nodes will start getting "icmp redirect". You should redisign your network so that the network that connects router b to PIX is a 30 bit. Like the first reply said, PIX is not ment to route inside traffic.

100
Views
0
Helpful
3
Replies
CreatePlease to create content