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Help with PAT on Cisco ASA 5520

whiteford
Level 1
Level 1

Hi,

I have a Cisco ASA 5520 and wonder if this is possible.

We have a server (172.24.10.13) on a VLAN off our 5520 that needs to connect to a SQL server (192.168.200.5) on the inside. No problem there, but I they want the VLAN server to user port 9999 instead of 1433 for SQL but want the inside SQL server to "see" the 9999 port traffic as 1433, possible?

I thought there might be a way to translate traffic sent as TCP 9999 to TCP 1433 before it his 192.168.200.5.

22 Replies 22

Collin Clark
VIP Alumni
VIP Alumni

Sure, it's call a port translation. Below is an example. Here we translate port 8080 on a public IP to port 80 on the inside web server.

static (inside,outside) tcp 69.222.73.5 8080 192.168.1.20 80 netmask 255.255.255.255

Hope that helps.

Thanks, I guess I will just need to add an access list for this aswell? Like an allow any to 69.222.73.5 to 8080?

Yep, you got it.

hmm, still having no luck.

I added:

static (DMZ_Web_Servers,inside) tcp 192.168.200.5 1433 172.24.10.13 9877 netmask 255.255.255.255

then added an access list to allow 172.24.10.13 to 192.168.200.5 on port 9877

I then tried to telnet to "192.168.200.5 9877" and it failed.

In your NAT statement your DMZ client is looking to 172.24.10.13 on port 9877 for SQL access. Is that correct? If so can you check your log when it fails?

My DMZ client is 172.24.10.13 and needs to use TCP 9877 to the inside server 192.168.200.5 and PAT to TCP 1433

Do you NAT between your DMZ or route?

I NAT

You'll need a new NAT address that translates to the inside. Something like this-

static (DMZ_Web_Servers,inside) tcp [new NAT IP] 9877 192.168.200.5 1433 netmask 255.255.255.255

I see, so I can't use the IP of teh DMZ server I need to use this PAT and only server can use this?

Yes, but anyone can use it, you'll restrict that with the ACL.

So I can use a random IP address from from the DMZ sunbet that is not in use?

Most people setup a special subnet just for NAT, but if you didn't then grabbing a local IP should work. However your current NAT's are setup.

Hi, just got curious, but shouldn't you have your static and acl statements like this?

static (inside, DMZ_Web_Servers) tcp 192.168.200.5 9877 192.168.200.5 1433 netmask 255.255.255.255

then add acl to (DMZ-int in) permit tcp host 172.24.10.13 host 192.168.200.5 eq 9877

This is just what I understood from the 1st post...

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