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New Member

interesting traffic issue

Guys quick one we have a firewall which is connected to a switch ....switch has a vlan 10 ip 10.30.30.2/24 ......the switch has a dhcp pool as well same subnet ...the firewall internal interface has 10.30.30.1/24 address same subnet ....interesting traffic is 10.30.30.0/24 .....in dhcp the default router is Asa internal interface .....but when we connect the pc to switch it doesn't get up address and if it gets it can't get dns information .... Am i doing something wrong by putting the internal interface on same subnet or. ....thanks guys

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2 REPLIES
Cisco Employee

interesting traffic issue

I would configure the DHCP pool on the ASA instead of the switch.

Here is the config guide on configuring DHCP server on ASA:

http://www.cisco.com/en/US/docs/security/asa/asa83/configuration/guide/dhcp.html

interesting traffic issue

Hi Bro

I don't see any problem with what you're doing. Can you paste your SW and FW config here, so that the others can also assist you. I believe as long as you have the lines shown below in your SW, all should be good.

!

ip dhcp excluded-address 10.30.30.1 10.30.30.5

!

ip dhcp pool TEST

network 10.30.30.0 255.255.255.0

dns-server 202.188.1.5

default-router 10.30.30.1

!

Just a quick question, if you were to put a fixed IP on a PC that's connected to the SW, can this PC go out to the Internet via the SW and FW?

Warm regards, Ramraj Sivagnanam Sivajanam Technical Specialist/Service Delivery Manager – Managed Service Department
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