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Single host network?

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Apr 7, 2009
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Hi every body.

Time ago I was working at some 3G/LTE site and I saw a BBU's routing table with:
1 route to /30 network.
4 routes to /32 networks.
Default route.
And same next hop for all routes.

What's the point of using a single host network?
I mean logic points out that single host doesn't send nor receive packets becuase it's totally isolated, or am I wrong?
I have done some GNS3 labs and I understand until /30 network (2 usable IPs, for example a link between 2 routers) but /31 and /32... No, I don't.
What would be the use (or benefit) of doing that in this case?

Thank a lot for your response.
 
Last edited:
Not everything needs a GW if the IP is on the same network. So it was most likely internal carrier vlan for idk status monitoring etc.

We use them alot for the DC.
 
I got the point after doing more labs, /32 address can be used as IP for loopback interface which always is up, also as router ID when dynamic routing protocol is used, also as IP for PPPoE client router or PPPoE dhcp server among others. For that particular case, yes, for internal carrier services. Thank Solaris17.
 
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