logging external redirect error

If LTM issues an HTTP 30x redirect to an externally hosted site, it can't track the result of the client's subsequent request. If you want to have LTM monitor the state of a host, you could configure it in a pool and add a monitor. The caveat with this is that you'd need to hard code the IP address(es) for the external site in the pool. If you wanted to resolve the hostname to an IP address dynamically, you could create an external monitor to do this:

 

 

http://devcentral.f5.com/wiki/AdvDesignConfig.TemplateForExternalLtmMonitors.ashx

 

 

Aaron

great suggestion.. but i dont think this solution is going to work for us. We get charged per request to that external vendor. If we have a health check running to that IP, its going to be too costly..

 

 

Thanks for the idea though.. i will put it in my drawer for future use..

Within HTTP there isn't a way to track the subsequent request of a redirect if it's to a different host.

 

 

Aaron

just wondering if replacing host header and logging in LB_FAILED event is usable (instead of redirection).

e.g.

74.125.235.31 is www.google.com.sg

[root@ve1023:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve1023:Active] config  b pool foo list
pool foo {
   members 74.125.235.31:80 {}
}
[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   HTTP::header replace Host "www.google.com.sg"
}

when LB_FAILED {
   log local0. "LB_FAILED is triggered"
}
}

[root@ve1023:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(53125) <-> 172.28.19.79(80)
1334382564.8509 (0.0011)  C>S
---------------------------------------------------------------
GET / HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.19.79
Accept: */*

---------------------------------------------------------------

New TCP connection 2: 172.28.19.80(53125) <-> 74.125.235.31(80)
1334382564.8579 (0.0069)  C>S
---------------------------------------------------------------
GET / HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: www.google.com.sg
Accept: */*

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