Q: Why does Road Runner kick me off every few weeks, and give me a new IP?

A: Because you're blocking all RFC1918 at your firewall.

Unlike other cable companies, Road Runner's DHCP servers use 10/8 addresses (or their relay-agents perform some sort of NAT).  So, if you're blocking all RFC1918 addresses at your firewall, at least allow the 10/8 space to communicate with your box via udp/67-68.  Annoying.  Here's a typical RR lease [dhclient/FreeBSD]:

lease {
  interface "rl0";
  fixed-address 71.75.172.132;
  filename "default.bin";
  option subnet-mask 255.255.240.0;
  option routers 71.75.160.1;
  option domain-name-servers 24.25.5.150,24.25.5.149;
  option domain-name "carolina.rr.com";
  option broadcast-address 255.255.255.255;
  option dhcp-lease-time 86305;
  option dhcp-message-type 5; 
  option dhcp-server-identifier 10.66.32.1;
  renew 1 2006/6/19 10:26:04;
  rebind 1 2006/6/19 19:25:28;
  expire 1 2006/6/19 22:25:17;
}

... compared to a typical CableVision lease [dhclient/Linux]:

lease {
  interface "eth1";
  fixed-address 67.85.206.67;
  option subnet-mask 255.255.224.0;
  option routers 67.85.192.1;
  option dhcp-lease-time 302400;
  option dhcp-message-type 5;
  option domain-name-servers 167.206.245.68,167.206.245.4,167.206.3.241;
  option dhcp-server-identifier 167.206.245.68;
  option broadcast-address 255.255.255.255;
  renew 1 2006/6/19 08:45:11;
  rebind 2 2006/6/20 19:59:14;
  expire 3 2006/6/21 06:29:14;
}

Whatever, figured I'd share that tidbit of information, since I've heard people whine about it before.

New comments are currently disabled for this entry.