Development issues regarding the cerowrt test router project
 help / color / mirror / Atom feed
From: Alexander Hulse <ah@amch.net>
To: cerowrt-devel@lists.bufferbloat.net
Subject: [Cerowrt-devel] Baby jumbo frames support?
Date: Sat, 16 Jun 2012 10:53:58 +0100	[thread overview]
Message-ID: <A9477301-990B-4447-A554-34865784EB29@amch.net> (raw)

I've done some basic research and some (unsuccessful) hacking the on the driver source for the ag71xx driver and was wondering about baby jumbo frame support?

I know that the WNDR37/800's built in switch supports passing jumbo frames, but the underlying router interfaces do not support large MTU frames.

However, this:

http://wiki.mikrotik.com/wiki/Manual:Maximum_Transmission_Unit_on_RouterBoards

seems to imply that the built-in interfaces ought to support baby jumbo frames, unless I'm misunderstanding what they are saying.

As to the "Why?", in the UK, the fibre offering by BT using FTTC uses a PPPoE modem that can understand PPPoE packets with an MTU 1508, as described in RFC 4638.

It was possible using a Netgear WNR834T with the application of some patches from the pppd git:

http://git.ozlabs.org/?p=ppp.git;a=commit;h=fd1dcdf758418f040da3ed801ab001b5e46854e7
http://wiki.aa.net.uk/index.php/FTTC_Modem

Would this be a useful feature to add (if possible) to CeroWrt so that full sized frames can be used if the ISP / connection supports it?

Alex

             reply	other threads:[~2012-06-16  9:54 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-16  9:53 Alexander Hulse [this message]
2012-06-16 12:54 ` dpreed
2012-06-21  0:50   ` Dave Taht
2012-06-21  0:58 ` Dave Taht
2012-06-21 13:33   ` Robert Bradley
2012-06-21 14:25     ` dpreed
2012-06-21 17:03       ` Robert Bradley

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://lists.bufferbloat.net/postorius/lists/cerowrt-devel.lists.bufferbloat.net/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=A9477301-990B-4447-A554-34865784EB29@amch.net \
    --to=ah@amch.net \
    --cc=cerowrt-devel@lists.bufferbloat.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox