On 12/29/14, 12:51 PM, Jay Ashworth wrote:
Ok. But the interface to which the cablemodem is attached, in the general single-DHCP-IP case, is a /24, is it not? I'm on TWC. The IP address I get from them is on a /20.
104.230.32.0/20 dev eth7 proto kernel scope link src 104.230.32.x
The example Valdis posted had 5 or 6 different /24s from all over the v4 address space; that seems exceptionally sloppy routing...
fw-1:/root # tcpdump -ni eth7 arp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth7, link-type EN10MB (Ethernet), capture size 65535 bytes 12:54:21.354278 ARP, Request who-has 173.89.105.161 tell 173.89.96.1, length 46 12:54:21.355881 ARP, Request who-has 104.230.27.232 tell 104.230.0.1, length 46 We all knows it's easier to add another secondary IP to the interface and add a new DHCP scope than to try to expand a subnet. Not sure I understand what all the excitement is about?