Buit in ethernet don't work after installing Lion

Question

Built in ethernet don't work after installing OSX 10.7 on my MacBookPro 2.4 Ghz Intel Core 15.
Someone else has the same problem?
On my MacPro 2 x 2.6 GHz Dual-Core Intel Xeon it's not working good, i have to do a restart to get internet connection.
Is there somebody who has te same problem and has a solution?

Answer 1

Something does look odd to me unless it's a typo in your post.
This look like what I'd expect from the NetGear Router - not form the modem. That is when You browse the router stats (http:/192.168.1.1)
I work with a modem with te folowing preverences:
Wan IP address    87.211.205.210
Lan IP address     192.168.1.1
Primery DNS server       62.58.50.5
Secondary DNS server   62.58.50.6
and a separate router Netgear WGT624v3
This is not exactly what I would expect from System Preferences/Network
the system preferences for the network are
Configure       by DHCP
IP address     192.168.1.15
Subnetmask  255.255.255.0
Router           192.168.5.1  <<<<<<<<<<< this should be 192.168.1.1??????
DNS              208.67.222.222
                     208.67.220.220
The Router address in System Preferences/Network should be the same as the LAN IP Address. In this case it's on a different network.
If this is not a type then this is a problem!
Not sure how it got to be that way.
Does it persist when resetting the modemand router?/
Steve