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daviddaoud2_205's avatar
daviddaoud2_205
Icon for Nimbostratus rankNimbostratus
Jun 03, 2008

BUG in iRule with SIP messages

Hello,

 

 

I have found what looks like a "bug" in the use of iRules to modify SIP messages and redirect them. Here is the thing:

 

 

My code looks like:

 

when SIP_REQUEST {

 

 

if { ( [SIP::method] equals "INFO" ) } {

 

 

log local0. " INFO IS HERE "

 

 

node 1.2.3.4 5060

 

 

}

 

 

The goal is simply to redirect the INFO messages to 1.2.3.4 (I could use the command pool, it's the same!). I can see in the log "INFO IS HERE", I can even modify headers for the INFO messages BUT the message is NOT redirected !

 

 

Why? Probably because there is some kind of SIP Persistence that forces the decision of the BIG-IP. This latter probably thinks: ' with this call-id I should send it to this server'.

 

 

However I havent configured any SIP persistence but just a simple SIP Profile (all options disabled).

 

 

Do you have a clue how to change this and provok the REDIRECTION of the messages?

 

 

 

Thanks a lot, I'm really stuck here!

 

 

Cheers,

 

 

David
application delivery
dev
devops
iRules

11 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 03, 2008
    Hi David,

     

     

    Going back to your last post on this (Click here), did your last rule work for your requirements? Do you have address translation enabled on the VIP? It seems like there is a requirement to have address and/or port translation enabled on the VIP if you want to specify a new destination IP and/or port. This seems fairly logical, but not something I expected at first in your last post.

     

     

    Aaron
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 03, 2008
    Or... maybe what you're running into is the default UDP packet handling? If you enable 'Datagram LB' on the UDP profile, does it resolve the issue?

     

     

    SOL3605: Configuring the BIG-IP system to load balance UDP packets individually

     

    https://support.f5.com/kb/en-us/solutions/public/3000/600/sol3605.html?sr=811334

     

     

    Aaron
  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 03, 2008
    Yes, the iRule worked: the problem was that when the option ADDRESS TRANSLATION was not activated, the new destination address wasnt changed by the BIG-IP.

     

     

    It works fine now with AT and port translation activated.

     

     

    But some messages are not redirected. In my example I receive am INFO SIP message whose URI is 123@1.1.1.1

     

    I dont want to send it to 1.1.1.1 but to 1.2.3.4 (on port 5060) ... and as I told you the command pool or node

     

    has no effect!

     

     

    The INFO still goes to 1.1.1.1 instead of 1.2.3.4.

     

     

    I don't know how to change this.
  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 03, 2008
    hmm sorry I didnt see your last post. Im using the Protocole Profile : UDP (default one).

     

    Let me try this and I get back to you in a minute.

     

     

    David

     

     

  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 03, 2008
    piew ... you are excellent man! You just solved my problem.

     

     

    Thanks a lot,

     

     

    it works fine with Diagram LB activated. I wouldnt have found it by myself! Thx again!

     

     

    David
  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 03, 2008
    A last question:

     

     

    Is there a way to modify SIP RESPONSES?

     

     

    It seems like the commands such as SIP::header remove

     

    work only on SIP requests.

     

     

    Is there a way to make them work on the RESPONSES too?
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 03, 2008
    I would guess SIP::header should work on both requests and responses, but I've never tested it. Can you post the code from the SIP_RESPONSE event in your rule? Do you see any errors in /var/log/ltm when the event is triggered? If you add a debug log line, do you see it logged?

     

     

    Aaron
  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 03, 2008
    when SIP_RESPONSE {

     

     

    if { [SIP::header Via] contains "192.168.113.99" } {

     

     

    log local0. " 200 OK coming from MGW to the module"

     

     

    SIP::header remove "To"

     

    SIP::header insert "To" ""

     

     

    }

     

     

    I can see the log message but none modifications are done.
  • daviddaoud2_205's avatar
    daviddaoud2_205
    Icon for Nimbostratus rankNimbostratus
    Jun 05, 2008
    Hey hoolio,

     

     

    please rescue me a second time!

     

     

    I don't find a way to modify SIP responses.

     

     

    Any idea ?

     

     

     

    Cheers,

     

     

    David.
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 05, 2008
    Hi David,

     

     

    Can you post your VIP configuration by running 'b virtual VIP_NAME list'?

     

     

    Thanks,

     

    Aaron