I am having problems with internet sharing PPPoE with Edimax BR-6104K. At the moment I am trying to connect my linux box to the Internet via this router.

The setup seems to be ok because I managed to get online and browse around a bit. BUT some sites like google, amazon.com load VERY slow and I cannot get into my gmail at all - it would just say after some time 'Document contains no data'.

When I connect my linux PC direct I have no problems at all - everything loads fast and I can access all sites.

I guessed it could be an MTU problem. On the router I set it to be 1480 (this one was assiged to me by ISP when I tried to connect my PC direct). On linux it used to be 1500 and I changed it to 1480 too. But still no joy...

Basically I tried many possible MTU settings and could not get google working notmally and gmail working at all.

I set the IP for router to be 172.20.20.1 with mask 255.255.0.0. I tried to turn on DHCP on the router, so that it would give my PC an IP, but it did not help... I also tried to turn off DHCP and assign my PC a static address 172.20.20.20 with 255.255.0.0 mask, but it would not work anyways. And I even entered my PC's IP into DMZ on the router, but could see no changes.

Note that I did make sure to remove all PPPoE related software and network interfaces before connecting the PC via router. Meaning that I can see only my eth0 and lo in ifconfig.

If anyone could give me any idea what is wrong I would very appreciate it.

If a direct connection uses MTU 1480 then you'll need to allow at least 8 bytes extra for NAT routing. Try setting the router to MTU 1472 (or lower).

My network runs MTU 1500 on everything except the router's PPPoE link to my ISP which is MTU 1492. I haven't experienced any problems with this. I guess the router fragments any >1492 packets when sending over the PPPoE link.

Thank you, I will try that too, but I tried already so many various MTU values (and nothing worked...) both on the router and on my local machine, that I am already at my wit's end...

Nah... It did not work - the same old problems