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hung_105573's avatar
hung_105573
Icon for Nimbostratus rankNimbostratus
Jul 25, 2012

F5 Can not change Ip NAT to IP other when line downs

Hi all

 

 

I'm a new F5 , My F5 is GW internet for users to internet and publish some server to internet.

 

 

Current , I'm facing problem as:

 

 

Users---------F5--------3 lines internet

 

 

I have config virtual servers

 

 

Destination : 0.0.0.0/0.0.0.0

 

Services port: All

 

Type:Performance layer 4

 

Protocol: ALL

 

VLAN and Tunnel Traffic :all

 

SNAT Pool :AutoMap

 

Default Pool:Default_GW_Pool

 

Default Persistence Profile:Dest_Addr

 

 

Anything work good , but when 1 lines goes down then some users can not access to internet ,

 

 

I used tcpdump then i saw this is user of address translation to ip public of line Internet1 , so when the line internet1 went down then the user can not access internet ( the Users other work good) . ( Default gateway pool is Round robin loadbalance )

 

 

 

Why does the line internet goes down then F5 can not NAT source of users to Ip public of line internet other ?

 

Can you pls give me a solution to the fix it ?

 

 

Many thanks all !

 

 

 

3 Replies

  • Hi Hung,

     

    There must be an irule on your LC box which is making these users stick to one ISP only. You can run a small test the users who still work fine after the first ISP link failure use their IP on the ones who don't work after link failure.

     

     

    Regards,
  • Hi all

     

    I had double check , Ping time out , but anything services other work fine

     

    I didn't know why ?

     

    thanks all