I’m trying to set up a static IP on an Ubuntu machine that is connected to the internet via a Comcast gateway (SMC).
Following their instructions I added this to the /etc/network/interfaces (the static IP is, for example 220.127.116.11, and gateway is supposed to be 18.104.22.168):
auto eth0 iface eth0 inet static address 22.214.171.124 netmask 255.255.255.252 gateway 126.96.36.199
However, after I restart networking I loose internet access. (and I can’t investigate further as I’m remotely connected.)
Any ideas on what I’m missing?
The SMC piece-of-junk that Comcast gives business customers doesn’t actually route your IP addresses into your network. Instead you have to set up 1:1 NAT and have the public IP address mapped to a private (RFC 1918) address on your LAN. Which, of course, means that all the computers on your LAN have to have RFC 1918 addresses.
Log in to the SMC piece-of-junk (defaults:
highspeed) to complete the configuration. You will need to be on site to do this, since the web-based configuration is only accessible from the LAN side.
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