[ale] MTU's and DSL's

[James P. Kinney III]

On Wed, 2005-04-20 at 13:39 -0400, Dow_Hurst wrote:
> I've had to use MTU=1412 for the network behind a NAT firewall connecting via PPPoE over DSL since the PPP tunnel imposed a lower maximum value for the MTU.  Might depend on the protocol being packaged too as to what is most efficient.
> Dow
> 

I'm familiar with the PPPoE overhead. But this is the lowest MTU I have
ever seen (768). I have the same type of data connection and it runs at
MTU 1500. This was not a problem with the Earthlink SDSL line. It is not
a problem with my multiple Speakeasy ADSL lines (the poor mans T1: dual
3M/768K ADSL).
> 
> -----Original Message-----
> From: "James P. Kinney III" <jkinney at localnetsolutions.com>
> Sent: Apr 20, 2005 12:52 PM
> To: Atlanta Linux Enthusiasts <ale at ale.org>
> Subject: [ale] MTU's and DSL's
> 
> Does NAT impose some MTU changes? I just had to set the MTU on a web
> server down to 768 to get the traffic passing back out the firewall and
> up a Speakeasy DSL line.
-- 
James P. Kinney III          \Changing the mobile computing world/
CEO & Director of Engineering \          one Linux user         /
Local Net Solutions,LLC        \           at a time.          /
770-493-8244                    \.___________________________./
http://www.localnetsolutions.com

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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