5.4-RELEASE and 5.5-RELEASE Slow routing table response

[Kevin Day]

On Feb 22, 2007, at 1:45 PM, Jeremy Nelson wrote:

> I have an Internet proxy that is running FreeBSD 5.4-RELEASE.  This  
> server has been up and running beautifully for about a year and a  
> half with no issues.
>
>   Just the other day I had a user try to connect to a host on the  
> Internet and her connection was failing.  At first I thought that  
> it was the receiving host's issue because we were having no other  
> Internet connection issues through the proxy.  However, I ran a  
> test connection from my home and found that everything worked fine.
>
>   After investigating the issue I found that if I ran a "route get  
> xxx.xxx.xxx.xxx" on my proxy server it would take 1.25 minutes for  
> the route to come back.  This same delay was also experienced if I  
> tried to use telnet to open a connection to the remote host.  After  
> about 1.25 minutes the session would open successfully.
>
>   So I ran "route monitor" and found that when I execute the "route  
> get" command the RTM_GET returns the appropriate route almost  
> immediately but there is still a substantial delay in the "route  
> get" command displaying the response.
>
>   I ran this test on three other 5.4 and one 5.5 servers and found  
> that they all had the same issue.  However, if I ran the same  
> "route get" command on a 5.3 server it works just fine.
>
>   After all of my testing I wanted to know exactly what IP address  
> range was affected and found that it is limited to just 60 address  
> within a specific range (I can provide the range).
>
>   Any help you could provide would be greatly appreciated.
>
>

This is almost definitely a DNS issue.

Try "route -n get"  or "telnet -N" and see if it still happens.

-- Kevin