03-12-2004 02:07 AM - edited 03-09-2019 06:44 AM
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.
Using the example here:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/config/bafwcfg.htm#1113041
I managed to work up the following config:
PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxx
passwd xxxx
hostname pixfirewall
domain-name mysite.com
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
names
access-list acl_out permit icmp any any
pager lines 24
logging buffered debugging
mtu outside 1500
mtu inside 1500
ip address outside A.B.C.130 255.255.255.192
ip address inside A.B.C.193 255.255.255.192
ip audit info action alarm
ip audit attack action alarm
arp timeout 14400
nat (inside) 0 A.B.C.130 255.255.255.255 0 0
access-group acl_out in interface outside
route outside 0.0.0.0 0.0.0.0 A.B.C.129 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http A.B.C.200 255.255.255.255 inside
floodguard enable
telnet timeout 5
console timeout 0
terminal width 80
I can ping the router (outside) from the PIX, and I can ping hosts on my network (inside) from the PIX, and vice versa. I can't seem to transverse it, though, with ping or http requests.
Anyone see the problem with my configuration?
Thanks,
CW
03-12-2004 04:41 AM
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.
how many hosts do you have inside?
03-12-2004 10:20 AM
Two things...
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).
Am I missing something?
- CW
03-13-2004 06:27 PM
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
03-12-2004 11:38 PM
Hmmm...I have a curiosity question here.
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?
- CW
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