We have just had a gigabit leased line installed, they have provided us with a /27 however the routing seems a little strange.
Normally i would have thought the ISP would have routed the /27 via a /30, is this what other people have experienced ?
However in this case we have been given:
- 22.214.171.124 as the gateway on their side.
- 126.96.36.199 with a subnet mask of 255.255.255.0 to use on our side.
- 188.8.131.52/27 as our ip block.
So i've set it up on the routerboard as a test:
eth1 - 184.108.40.206/24
eth2 - 220.127.116.11/27
then laptop plugged into eth2 with ip 18.104.22.168/27
routes 0.0.0.0/0 via eth1
Unless i enable proxy arp on eth1 the laptop is not reachable on its ip and from what i understand it enabling proxy arp wouldnt be best practice in this instance. Also the broadcast domain is larger than our ip allocation. I would image the isp has other subscribers within the 22.214.171.124/24 ip block.
I'd appreciate some feedback on this in terms of proxy arp and the way the isp has done the routing?