Today I had a chat about MTU with a customer. MTU is my second favorite topic for tech talks in front of the coffee machine, STP is still the first because there are so many misconceptions about it. Even QoS is funny, people has many creative ideas and expectations from it.

Let's talk about MTU. Everything begun today …

Quick note about PPPoE address assignment.

IPCP

CLIENT

interface Dialer1
**ip address negotiated**
encapsulation ppp
dialer pool 1
dialer idle-timeout 0
dialer persistent
end

SERVER

ip dhcp-server 10.0.12.1
interface Virtual-Template10
ip address 10.0.32.2 255.255.255.0
peer default ip address dhcp
end

DHCP

CLIENT …