Solved

Asymmetric Routing (Firewall)

Posted on 2016-09-12
3
77 Views
Last Modified: 2016-10-09
Is it possible to have asymmetric routing from a stateful firewall?  The firewall will keep the connections in the state table, but it not the way its routed?
0
Comment
Question by:PeraHoman
3 Comments
 
LVL 27

Accepted Solution

by:
Predrag Jovic earned 250 total points
ID: 41795392
It is not possible if you perform natting on firewall. How will device that receive packets know where is located source of the traffic since there is no NAT table?
Typically for asymmetric routing you need two connected firewalls.
Asymmetric Routing and Firewalls
0
 

Assisted Solution

by:PeraHoman
PeraHoman earned 0 total points
ID: 41796999
Natting is done on the FW.  I was just wondering if this was possible.  

We see hits on our FW logs about traffic leaving our FW destined our Vendors public server, but there are no hits on return traffic from the Vendors server back to our FW.
0
 
LVL 14

Assisted Solution

by:SIM50
SIM50 earned 250 total points
ID: 41800357
It's not possible for dynamic NAT but possible for static NAT. Unlike dynamic, where entries are created in xlate table for the current traffic going through, static NAT entries are added upon the configuration and work for any direction. So if you would have two ASA's with the same static NAT and ACLs and configured tcp state bypass, it would be possible for asymmetric routing to happen.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

825 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question