Aol Adsl

I am helping a friend (via msn/phone) get his internet working.

He has AOL ADSL, via ethernet.
His router is all setup, and reserving him an IP via DHCP.

In Windows he used to have to change his MTU to 1400 in order for the Internet to work.

I can't find any info on AOL DSL / Changing MTU in Linux / Ubuntu.

I told him to sudo ifconfig eth1 mtu 1400, which I saw on google;
It didn't return any errors, just went to the below line.
I don't know if there is any commands before/after this - or how to restart the network.
All I know is this command didn't get the Internet working.

Any and all help is highly appreciated.

Thank you

read man pppd

mtu n Set the MTU [Maximum Transmit Unit] value to n. Unless the peer requests a smaller value via MRU negotiation, pppd will request that the kernel networking code send data packets of no more than n bytes through the PPP network interface. Note that for the IPv6 protocol, the MTU must be at least 1280.

That very long manual didn't help.

Btw, the network/LAN works fine.
Just the Internet isn't working.

You can set mtu in the specific script you use to call pppd, the one in /etc/ppp/peers, or you can set it globally (for all pppd connections) in /etc/ppp/options, or you can set it on the command line when you call pppd

He doesnt use pppd, he isnt dialing up to the internet, he's connecting via a router.

He can broswe his network, he can even PING google.com and 216.239.59.99 successfully.

He just cant browse or use instant messengers or anything :S