how to write an iRule to redirect traffic to different pool based on URIs and need do client IP nat

[xiaolin_chen_11]

I am a new comer to iRules. Now we have following requirement :default or main page/site :https://default.domain.comsiteAhttps://ht.domain.com/gwsiteBhttps://ht.domain.com/secsiteChttps://ht-prd.domain.com/gwSiteDheeps://ht-prd.domain.com/secPools :Default_pool PoolA (for siteA and site B ) use tcp port 8398 PoolC (for site C and site D) use tcp port 8240SSL terminate on LB .when the uri equals https://ht.domain.com/gw or https://ht.domain.com/sec , send them to PoolA , port 8398, and client souce address need to be nat.when the uri equals https://ht-prd.domain.com/gw or https://ht-prd.domain.com/sec , send them to PoolB , port 8240, and client souce address need to be nat.when the uri is other than above four. then send them to default Pool.Additional Notes :1. All the clients are from Internet . Web servers in PoolA and PoolB are not connected to LB direcly. It need L3 routing to get to them . So we need nat client souce IP to a specifc ip address, then when web server's reply can come back to LB , otherwise the reply will go to internet through another route. I tried to write an iRule for this, but do not know how to do nat:when HTTP_REQUEST { set myURI [string tolower [HTTP::uri]] if { $myURI contains "ht.domain.com/gw" } { HTTP::uri /ht.domain.com:8398/gw pool poolA } elseif { $myURI contains "ht.domain.com/sec" } { HTTP::uri /ht.domain.com:8398/sec pool pollA } elseif { $myURI contains "ht-prd.domain.com/gw" } { HTTP::uri /ht-prod.domain.com:8240/gw pool poolC } elseif { $myURI contains "ht-prd.domain.com/sec" } { HTTP::uri /ht-prod.domain.com:8240/sec pool poolC }else { pool Default_Pool }}Any assistance/examples/suggestions would be greatly appreciated.Thanks Xiaolin

[dennypayne]

Some things that will help terminology wise:https://ht.domain.com/gw is a URL, not a URI. A URI is everything after the hostname, so here ht.domain.com is returned by [HTTP::host]. [HTTP::uri] only returns /gw. So you'll need to fix your if statements to reflect that.What you are referring to as client NAT is called a SNAT on BIG-IP. So you'll need to add a snat statement to the rule where you want that to happen.Finally, BIG-IP will do the port translation to the pool by default so you don't need to manually set the URI to use the ports.So you should end up with something like this (I have not validated syntax exactly):

when HTTP_REQUEST {
set myURI [string tolower [HTTP::uri]]
set myHOST [string tolower [HTTP::host]]
if { $myHOST == "ht.domain.com" and $myURI contains "gw" } {
  snat automap
  pool poolA
} elseif { $myHOST == "ht.domain.com" and $myURI contains "sec" } {
  snat automap
  pool poolA
} elseif ...
(and so on)
}else { pool Default_Pool }
}

Hope that helps,Denny

[xiaolin_chen_11]

Thank you very much , i think i can modify a little and test it soon . I am on vocaion next week , Maybe my colleague will go on this . I will let you know the result.