Forum Discussion
NimbostratusRemove subnet from NAT pools without any impact
Hi zztop123 ,
Look ,
you should first see how this pool of NAT IPs used , see if it's used by huge amount of traffic , or by little or isn't used.
if this subnet not used , you can remove it , it will not cause any impact.
but if this subnet is used much in NATing you should remove it , as you maybe impacted by port exhausion so at this case you shouldn't remove it.
So the impact only is with port exhausion not anything else.
Hi zztop123 ,
Well ,
Go to ( Local Traffic >> Address translation >> SNAT pool list >> open the SNAT list you need , then select all IPs that you need to remove ) , you can record these ips in external txt files .
Click update and monitor the behavior , if there is an impact you can put these Ips from the txt file again and click update.
by this you did the rollback.
I want to ask you , maybe I miss understand you , you're speaking about SNAT pools which attached to virtual servers ? or you meant another pools
Please clarify
NimbostratusHi Mohammed,
Its not SNAT pool , just a NAT pool. is the procedure the same for it ? Please find the screen shot
Hi zztop123 ,
ohh , this AFM NATing.
first you need to see if this subnet is used in transulations or not
> look at logging profile.> use this command on bash ( #tmsh show sys connection > /var/tmp/AFM_NAT.txt )
This is the Article to view the connections : https://my.f5.com/manage/s/article/K53851362
you can use filters
I recommended to move these the connections to a text file , because it may impact your device performance if you viewed these connections in bigip cli.
then remove this subnet.
but I can't measure the impact if there is impact from removing this subnet , it depends on your number of subscribers.
Seeing if this subnet is used much or not may help you to detect if this will case a shortage in available ips or not.
If this a deterministic NAT you can calculate the estimated number of reserved ips for each subscriber , look at this article : https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/cgn-implementations-11-5-0/13.html
