Re: MTU 1640

On 12/26/2014 03:12 AM, Jakob Schwienbacher wrote:
> Hi,
>
> Im running M0n0wall 1.8.1. Im using PPPoE to connect to my ISP. I had some
> trouble with MTU size, then i saw my WAN MUT is set to 1460:

Several things here...

First, reboot resets m0n0wall back to stock.  All that custom config 
stuff outside of the actually config xml file is lost.  Makes hacking 
nice as a reboot fixes whatever you broke. :)

Next, PPPoE is had, because very few people have it anymore for testing. 
  I was one of the last, and lost it 6 months ago.

So, 1492 is the theoretical max.  But people were still having problems 
that seemed MTU related.  And it was found that a few places using PPPoE 
were also packaging more crap in the packets than 8 bytes.  Going a 
little further than needed fixed a lot of problems that we could not 
properly troubleshoot.

Now, if you want to play with it, please do!  You will have to set 
everything from the CLI as using the GUI to tear it down and rebuild 
will probably reset it to 1460.  I have not seen the actual code.  Other 
did that work...  So you would probably gain a lot by unpacking an image 
and really looking at how things come together in that segment of the code.

The question is, do you really want to do that for 30 bytes?

			Lee