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DMZ with 12500 and ASA

 
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stsemeaomg
Occasional Visitor

DMZ with 12500 and ASA

Hello

 

I am trying to bring a DMZ online, however I am having a small problem and I belive the problem with assymetric routing. I know this isn't a Cisco ASA forum, however I'm hoping someone can spot the obvious issue that I belive is down to my routing on the 12500. (I've changed some details but that won't matter)

 

On the 12500 I've setup the VLAN with this IP address

 

interface VLAN 244

10.10.244.4

 

On the ASA I have setup the DMZ interface to have this

10.10.244.1

 

All computers in the DMZ are attached to the core switch, however their gateway is the firewall. The 12500 does NOT advertise the 244 VLAN via OSPF but the firewall does so here is the routing table on the 12500 (10.1.1.2 is the ASA)

 

<12500>dis ip routing-table 10.10.244.0
Routing Table : Public
Summary Count : 2

Destination/Mask Proto Pre Cost NextHop Interface

0.0.0.0/0 Static 60 0 10.1.1.2 Vlan1000
10.10.244.0/22 Direct 0 0 10.10.244.4 Vlan244

 

The ASA

 

ASA# sh route DMZ244

C 10.10.244.0 255.255.252.0 is directly connected, DMZ244

 

However I see this alert on the ASA which tells me the routing is not correct, however I don't know how to fix the issue. Does anyone else have experiance with trying to setup a DMZ this way using H3C switches? 

 

Deny TCP (no connection) from 10.10.244.53/3389 to 10.5.21.92/53519 flags SYN ACK  on interface DMZ244

 

Any help appreciated

 

Thanks

 

 

4 REPLIES
Vince_Whirlwind
Trusted Contributor

Re: DMZ with 12500 and ASA

Why don't you get rid of the IP address from the A12500 DMZ VLAN interface.

stsemeaomg
Occasional Visitor

Re: DMZ with 12500 and ASA

Because then I can't even ping 10.10.244.1 (the ASA) from the 12500, even if I try (10.10.240.1 is inside network gateway also on the 12500)

 

ping -1 10.10.240.1 10.10.244.1

 

Vince_Whirlwind
Trusted Contributor
Solution

Re: DMZ with 12500 and ASA

That's normal - the question would be - with that address gone from the 12500, can your devices in the DMZ subnet connect to the ASA, or through it as per whatever rules you have configured?

stsemeaomg
Occasional Visitor

Re: DMZ with 12500 and ASA

Ah, excellant, that worked. Small rule in the firewall needed but that was it. I was simply replicating what I had on my Cisco enviroment, this way didn't work with the H3C system it appears. Thanks for the help, that was an easy fix