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Chris_Phillips's avatar
Chris_Phillips
Icon for Nimbostratus rankNimbostratus
Feb 16, 2006

Forward using hostname as node, not IP

 

Hi,

 

 

I require the ability to create a forwarding server to forward traffic to a hostname rather than an IP address. A third party we are connecting to provides resilience to their systems by a DNS service, allowing them to provide a hostname rather than a string of potential IP addresses and such. Whilst I can add a node to the big-ip by using a hostname, the hostname is resolved to an IP at configuration time. Instead I require a DNS lookup to be performed on a regular basis when the virtual server is in active use. This does not seem possible within the 9.1.1 software, and would appreciate any information to the contrary, or potential workarounds if any are forthcoming.

 

 

Thanks

 

 

Chris
application delivery
dev
devops
iRules

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  • Ethan_Erchinger's avatar
    Ethan_Erchinger
    Icon for Nimbostratus rankNimbostratus
    Mar 12, 2006
    For completeness.

     

     

    I've captured some data from this thread and from another thread, that are related, in the Codeshare available at:

     

    http://devcentral.f5.com/wiki/default.aspx/iRules/DestinationSnatUsingDNS.html

     

     

    Also, the other article I speak of, listed below, talks about a small bug in the above code. See the post from "3/11/2006 7:21 PM".

     

    http://devcentral.f5.com/Default.aspx?tabid=28&forumid=5&view=topic&postid=6899
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Mar 12, 2006
    you can make sure the changes survive an upgrade by adding whatever system files you change to the cs.dat file in /usr/libdata/configsync. After you've specified the files here (check first to make sure they aren't already included), they will be backed up when you do a bigpipe config save (and when you do a sync)

     

     

    Note that there is a problem with adding /etc/syslog-ng/syslog-ng.conf to cs.dat if you are upgrading, search ask.f5.com for the details.
  • Anthony_Gerace_'s avatar
    Anthony_Gerace_
    Historic F5 Account
    Mar 17, 2006
    This looks really interesting. What versions of LTM is this supported in?

     

     

     

    Thanks.

     

     

     

    Anthony