topic Re: ASA Routing (Network Addressing) in Network Security

ASA Routing (Network Addressing)

csco11029214 — Fri, 21 Feb 2020 09:45:38 GMT

Hello,

I have configured an ASA 5510 at our data center. The problem I am facing is that in the network range of 0 to 255 there are servers with /24 masking and these are already routed by the router. I want to deploy the ASA firewall only to 6 of these servers which currently have the address from .9 to .14 and the firewall has the address .8 on its internal interface. How should I deploy or further subnet the network of /24 so that these 6 servers can be routed through the firewall instead of the router.

Regards,

Murtaza

Re: ASA Routing (Network Addressing)

Jon Marshall — Thu, 01 Nov 2007 20:13:14 GMT

Hi Murtaza

You have a couple of choices really.

1) If you don't want to readdress your servers you could use the ASA in transparent mode and place the 6 servers in one vlan and leave the rest of the servers in the original vlan. Note that your are using 2 vlans but the same IP subnet and the ASA bridges between the 2 vlans.

2) Create a new subnet for your 6 servers plus the ASA ie. a /29 or /18 subnet would do the trick but obviously you now need to readdress both your servers and the inside interface of the ASA.

HTH

Jon

Re: ASA Routing (Network Addressing)

csco11029214 — Thu, 01 Nov 2007 20:35:13 GMT

Thanks Jon,

Both the options are quite achievable although the first one looks better, will have to work around with it. Thanks again.

Regards,

Murtaza