getting to an ip in 255.255.252.0

phishman3579 · 09-12-2003, 02:38 PM

My buddy's cable modem ISP gave him an IP in the 255.255.252.0 subnet, I am trying to reach it from outside the network. Is there any way I can access it?

maybe 123.345.456.678 /22?

fsbooks · 09-12-2003, 03:01 PM

Maybe I'm way off base, but the netmask of your buddy's machine shouldn't matter for you to reach it. All you need is his IP and you should beable to ping it, login into it (with account, of course), whatever you want. That of course assumes the IP is "real" and not a NATed local one, which is unfortunately becoming a trend (the Internet as fancy TV).

tarballedtux · 09-12-2003, 03:14 PM

That IP should work for a few reasons:

1) The netmask doesn't really determine much of anything on your side. It only matters to your ISP as they will handle the decision on how to get your packet where it needs to go.

2) Its a public IP. (i.e. Does not start with 10. or 172.16 or 192.) As long as his ISP can route everything correctly

3) His ISP should not be filtering out SSH or telnet.

--tarballedtux

voltron1011 · 09-17-2003, 02:56 PM

why don't you scan his ports and find out which ports are open.... He could have a NAT router that completly seals him off from outsiders. If he is behind a NAT, he'll need to establish a static route to his machine within the firewall (open a port directly to his machine).