Question

Site to Site VPN with access to remote DMZs (Cisco PIX515)

Asked by: Rhubarb

Hi all,

I have a site to site VPN, with site A being 172.16.1.x and site B being 172.16.2.x. This is between a pair of Cisco 515Es with 4 port DMZ cards in each.

Site B also has DMZs 192.168.1.x, 192.168.2.x, 192.168.3.x and 192.168.4.x.

The site to site VPN works as expected, but I would like users in site A to be able to reach services in site B's DMZs, I'm just using a host in 192.168.1.x for testing.

I've added the following to site A's nonat and VPN ACLs:

access-list nonat permit ip 172.16.1.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 101 permit ip 172.16.1.0 255.255.255.0 192.168.1.0 255.255.255.0

I see the hit counts for these rules increment as I attempt to access the test service.

At site B I've then added access for site A's hosts to reach the DMZ hosts

access-list insidein permit ip 172.16.1.0 255.255.255.0 192.168.1.0 255.255.255.0 eq https

But never see this hit counter increment when I request an HTTPS page from a host in DMZ1.

What rule have I missed?

Many thanks.

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Asked On
2006-06-07 at 09:46:27ID21878148
Tags

dmz

,

vpn

,

cisco

Topic

Virtual Private Networking (VPN)

Participating Experts
1
Points
125
Comments
3

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Answers

 

by: stressedout2004Posted on 2006-06-07 at 13:02:21ID: 16855847

You have to do two things:

1) Modify the match address for the VPN on *both* sides not only on one site.

e.g.

Site A:

access-list 101 permit ip 172.16.1.0 255.255.255.0 172.16.2.0 255.255.255.0
access-list 101 permit ip 172.16.1.0 255.255.255.0 192.168.1.0 255.255.255.0
crypto map siteA 10 match address 101


Site B:

access-list 101 permit ip 172.16.2.0 255.255.255.0 172.16.1.0 255.255.255.0
access-list 101 permit ip 192.168.1.0 255.255.255.0 172.16.1.0 255.255.255.0
crypto map siteB 10 match address 101

2) You should add another access-list entry for the NAT 0 on Site A to include the 192.168.1.0/24 subnet.

e.g

access-list nonat permit ip 172.16.1.0 255.255.255.0 192.168.1.0 255.255.255.0

3) On site B, you will need to create a separate access-list entry for the NAT 0 applied on the interface where the actual 192.168.1.0/24 is located. For illustration purposes, lets say that 192.168.1.0/24 is actually on the interface named dmz1 on PIX B. Then you will need to add:

e.g

access-list dmz1_nonat permit ip 192.168.1.0 255.255.255.0 172.16.1.0 255.255.255.0
nat (dmz1) 0 access-list dmz1_nonat

So on your Site B, you will actually have two nat 0 lines, one for the inside network 172.16.2.0/24 and one for the dmz.

e.g

access-list inside_nonat permit ip 172.16.2.0 255.255.255.0 172.16.1.0 255.255.255.0
access-list dmz1_nonat permit ip 192.168.1.0 255.255.255.0 172.16.1.0 255.255.255.0

nat (inside) 0 access-list inside_nonat
nat (dmz1) 0 access-list dmz1_nonat


Regarding the acl "access-list insidein" which interface is it applied on?








 

by: RhubarbPosted on 2006-06-08 at 02:02:02ID: 16859610

Thanks for the help - I'm out the office now until tomorrow so there will be a short delay in testing it - sorry, will keep you posted.

Regarding your question, insidein is applied to the internal interface.

 

by: RhubarbPosted on 2006-06-12 at 09:25:07ID: 16886925

Many thanks, I was missing just the acl 101 for the site B end of the tunnel.

A perfect answer and really clear, thanks again.

20120131-EE-VQP-002

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