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FTTC Modem: Difference between revisions
Added info about RFC 4638 and enabling on Linux / OpenWRT
(Added info about RFC 4638 and enabling on Linux / OpenWRT) |
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#Then will in the account name and password, click Connect (keep service name blank)
#You should be online, you may want to check firewall settings
=RFC 4638 Information=
Some pointers regarding RFC 4638, PPPoE and Linux-based routers.
#The wan interface needs to be set to an MTU of 1508 on the assumption that there needs to be room for the 1500 mtu PPP package on the way to the modem (1500 may work - untested though).
#You will require the unreleased ppp 2.4.6. In testing, ppp 2.4.5 with the rp-pppoe plugin updated to the latest version seems to work, although a recompile will be necessary. This can be fetched from ppp's website / git.
#Using ppp's debug option will allow you to see the rp-pppoe plugin negotiating a PPP-Max-Payload option with the BRAS via an LCP option. If this isn't seen, then your MTU is forced back to 1492.
=RFC 4638 on OpenWRT 10.03.1 (Backfire)=
Getting RFC4638 on Backfire is somewhat tricky, but do-able if you're feeling like fiddling with code!
In order to make it work:
#create an OpenWRT build environment for the 10.03.1 release so you compile the new pppd release
#adapt the pppd 2.4.4 package definition to pull the 2.4.5 package from ftp.samba.org instead - you will need to update the version to 2.4.5 and the md5sum of the downloaded package.
#Pull the ppp 2.4.5 package patches from the (currently) "trunk" release and replace the 2.4.4 patches with these. The 2.4.4 patches are too outdated to apply to ppp 2.4.5.
#Use OpenWRT's patch making ability to create a patch that applies to 2.4.5 to update rp-pppoe to the latest release. The process is to create a new patch point in the build_root using quilt (see OpenWRT's wiki - surprisingly easy and well documented!), overwrite the 2.4.5 rp-pppoe plugin with the git version (ugly but it works...) and the generate a new patch to reflect the differences.
#Re-compile the ppp package to create an installable .pkg. This is why you created a patch - the OpenWRT compile routine will wipe out any changes you make to the build_root.
#Use SCP to copy the new ppp and ppp-mod-pppoe packges to your router's /tmp
#Install the updated packages with opkg on your router.
#Adjust yout /etc/config/network so that the MTU is now 1508
#Add the debug option to /etc/ppp/options
#Issue an ifup wan
#Have a look at the output of logread and watch what happens
#Check your interfaces with ifconfig
#Check clueless to see if it sees your mru 1500
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