httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "David P. Donahue" <ddona...@ccs.neu.edu>
Subject RE: [users@httpd] Narrowing Down A Strange Problem
Date Wed, 15 Sep 2004 17:35:58 GMT
I am interested in your suggestion to "lower the MTU of your server."
This is new to me and I would love to add it to my testing.  How would I
lower this value?  Note, I am running Apache 1.3.31 on Slackware 10.0.


> Hi, this seem to be a MTU related problem on the network layer. 
> Locations where access fails, should check with a full packet 
> dump of a 
> failed request. For some locations the packets go over a link 
> with MTU 
> of 1250b and proper PMTU discovery fails, so the TCP session simply 
> stucks until timeout...
> Maybe you can determine the hop by comparing the traces... 
> There not really much you can do with different impact: 
> Generally lower the MTU of your server to 1250b which impacts the 
> performance - more packets needed for same payload - or if 
> you are able 
> to determine exactly what ranges fail, intercept sessions with these 
> sources and force a lower mtu for only these links on your server or 
> router...
> If there is a braindead ISP on the hop who denies forwarding of "ICMP 
> fragmentation needed" packets, contact him and tell him to 
> pull the plug 
> and never reconnect until he employed someone who has knowledge of 
> TCP/IP networks...
> 
> 
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP 
> Server Project. See 
> <URL:http://httpd.apache.org/userslist.html> for more info. 
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>    "   from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
> 
> 


---------------------------------------------------------------------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
   "   from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org


Mime
View raw message