# NGinx Load Balancing

**URL:** <https://www.ruby-forum.com/t/nginx-load-balancing/166911>\
**Category:** NGINX\
**Created:** [April 30, 2009, 8:43pm UTC](https://www.ruby-forum.com/t/nginx-load-balancing/166911 "2009-04-30T20:43:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Payam\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/59ef9b/32.png) [@Payam\_C](https://www.ruby-forum.com/u/Payam_C)\
**Post date:** [April 30, 2009, 8:43pm UTC](https://www.ruby-forum.com/t/nginx-load-balancing/166911/1 "2009-04-30T20:43:32Z")

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Hey Guys,

Question, How can you create an nginx proxy server so it uses  
x-forward-header to load balance connections to its downstream web  
servers?  
Im using a nginx load balancer and attaching x-forward-header down to  
the load balaning farm which is using ipvs/keepalived which then load  
balances the traffic locally to a iis / apache cluster

issue is that from my nginx proxy to the ipvs LB as i use SNAT and the  
ipvs is only layer4. When a client re-establishes his connection  
though the nginx proxy, the system will change its src ip at random  
and if there was previously another connection using that  
src\_ip:dst\_port, then the IPVS will assign it to the new user…  
session jacking

I am thinking that the issue could be solved by placing an nginx load  
balancer in front of the ipvs and allowing nginx to load balance  
traffic based on the x-forward-header… however, this is something  
that I am not sure how to do.

any insight would greatly be appreciated

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**Author:** ![Payam\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/59ef9b/32.png) [@Payam\_C](https://www.ruby-forum.com/u/Payam_C)\
**Post date:** [May 1, 2009, 5:01am UTC](https://www.ruby-forum.com/t/nginx-load-balancing/166911/2 "2009-05-01T05:01:49Z")

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On Thu, Apr 30, 2009 at 11:29 AM, Payam C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> ipvs is only layer4. When a client re-establishes his connection  
> any insight would greatly be appreciated
> 
> –  
> Payam Tarverdyan Chychi  
> Network Security Specialist / Network Engineer

Any ideas? I would greatly appreciate any insight

Thanks,

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**Author:** ![Payam\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/59ef9b/32.png) [@Payam\_C](https://www.ruby-forum.com/u/Payam_C)\
**Post date:** [May 1, 2009, 4:36pm UTC](https://www.ruby-forum.com/t/nginx-load-balancing/166911/3 "2009-05-01T16:36:16Z")

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Maybe this entry will give you some information. And it’s in Chinese,  
but I  
think the source codes at this entry will enough for you to understand  
it .  
[http://www.libing.name/2008/12/30/nginx-ip-hash.html[?]](http://www.libing.name/2008/12/30/nginx-ip-hash.html%5B?%5D)