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Community Member


I'm having an issue where I can sit on the PIX and ping everything on the internal network. I can ping everything I've allowed on the external network as well. However, I can't get traffic across the NAT to ping. Here's the config:

PIX Version 6.3(5)

interface ethernet0 auto

interface ethernet1 100full

nameif ethernet0 outside security0

nameif ethernet1 inside security100

hostname another-fw1

access-list outside_access_in permit ip host NAMED-SOMETHING any

access-list outside_access_in permit icmp object-group icmp-sources any

icmp permit any inside

mtu outside 1500

mtu inside 1500

ip address outside

ip address inside

arp timeout 14400

global (outside) 1 interface

nat (inside) 1 0 0

static (inside,outside) netmask 0 0

access-group outside_access_in in interface outside

route outside 1

route inside

Lame Layout Example


If I changed the NAT'd devices gateway to the PIX, then it works fine. BTW: The gateway isn't mine and I'm sure there isn't any type of route pointing back to me. I'm typically coming in from an external IP and I guess that my traffic is getting pushed out another direction once it hits their network.

So, would Source NAT work? Never used it.. So, I have no idea.

Community Member

Re: PIX 501 NAT

Hi Mike,

The NAT configuration you have done is okey. But the routing part seems to be giving you trouble.

You have configured two default routes:

route outside

route inside

You are getting problem due to second default route pointed to

Please make the second route more specific(don't used default route) e.g if you have network in inside section then use

route inside

Also see the translation and connection table

sh xlate

sh conn



Community Member

Re: PIX 501 NAT

Thanks for the reply!!!

Sadly, I've tried that.. I've even removed the old inside route, saved the config, and rebooted the PIX.

It still produces this:

[ERR]route inside 1

Route already exists

Community Member

Re: PIX 501 NAT

Without route to internal router

outside 1 OTHER static (What I added)

outside 1 CONNECT static (Shows by default since it's the interface)

inside 1 CONNECT static (Shows by default since it's the interface)

When I ping I get:

No route to from "Where I'm at" on the PIX debug log...

When I add the 172.16.x.x route

outside 1 OTHER static

outside 1 CONNECT static

inside 1 OTHER static

inside 1 CONNECT static

When I ping now... I don't get the "No Route" but I don't get replies either.

Reminder, I can ping everything on the internal and external network from the PIX. However, Outisde in and Inside out doesn't work even though it's allowed...

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