firewall contexts

Answered Question
Jan 30th, 2010


We have a requirement to create 2 contexts & 1 admin context on a HA based ASA. The local ip range i have is /24.

Internet traffic will be coming on to this context, although there will be only one single internet line and not two different ones for each context.

Please help me as to how the ip assignments on these contexts must be made wrt to HA pair.A brief overall config including ip address would be very much appreciated.

Thank You.

I have this problem too.
0 votes
Correct Answer by Kureli Sankar about 6 years 10 months ago

Yes that is correct. Context 1 and context 2 are two different firewalls.


Correct Answer by Kureli Sankar about 6 years 10 months ago

That is correct. You did understand it correct.


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Overall Rating: 5 (2 ratings)
suthomas1 Sat, 01/30/2010 - 23:25

(EDIT): these also need to have a DMZ interface on each of them. How is that also be incorporated in this.


suthomas1 Mon, 02/01/2010 - 07:51

Thanks for the great link. Another query though, since the firewall is in an HA mode, how do we allocate public ip address on its internet facing interface.

viz, would the admin context also need to be put in with ip address or is it only for the other 3 contexts interface. If so, would each context on active firewall have different public ip address and would same apply to standby firewall.

Appreciate any assistance!

Kureli Sankar Mon, 02/01/2010 - 08:31

Good question. We do recommend to add a standby IP for all interfaces. If you have available addresses I would add a standby IP address for the outside interface for all the contexts. Otherwise you can leave it just with the active IP. Failover will still work. Just monitoring interface will not work.

When you issue sh fail, active unit will show up with an IP address but the standby unit will show up as That is all.


suthomas1 Mon, 02/01/2010 - 09:17

thanks for the prompt help. to make it more easily digestible to me, below is the
sample config i have done to enact this scenario:

each context will have a different organisation on it.

FWA(Active) - Context 1 & Context 2
FWB(Standby) - Context 1 & Context 2

Assuming public ip's to be /29


On FWA- context1: i assign IP /29 on public interface
On FWA- context2: i assign IP /29 on public interface

(Or does it mean that Context2 doesnt have to be assigned any ip or the same as Context1) ?

On FWB- context1: Unassigned
On FWB- context2: Unassigned

Is this correct as per my understanding of your post.

Tons of thanks to you!

suthomas1 Mon, 02/01/2010 - 09:32

Ok. that means Context1 & Context2 will have seperate translation tables ?


Correct Answer
Kureli Sankar Mon, 02/01/2010 - 09:39

Yes that is correct. Context 1 and context 2 are two different firewalls.



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