I'm trying to set up a server with a /29 network address (I've been given a subnet on my DSL connection).
I set the router's LAN IP to the gateway for the range (call it xxx.xxx.xxx.176).
I then proved the routing with a Windows box and pinging google - setting the IP address to xxx.xxx.xxx.177 and with a subnet of 255.255.255.248
Then I tried to set my server up - I downed the network service and edited the interfaces file:
auto eth0 iface eth0 inet static address xxx.xxx.xxx.178 netmask 255.255.255.248 gateway xxx.xxx.xxx.176
But when I restarted the network service, I got a message
SCIOADDRT no such process
I could ping the 177 computer, but not the gateway - and routing to external addresses was right out.