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Single host network?

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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:

Solaris17

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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.
 
Joined
Apr 7, 2009
Messages
343 (0.08/day)
Location
Valencia, Venezuela
System Name Tropicaliente | Digger | A515-43-R19L
Processor FX-6300 | Q6600 | R3 3200U
Motherboard ASRock 970 Extreme 4 | Gigabyte X48T-DQ6 | Grumpy_PK
Cooling EVGA CLC120 | OCZ Vendetta | Stock
Memory 16GB DDR3-1600 | 8GB DDR3-1333 | 12GB DDR4-2666
Video Card(s) PowerColor RX-570 4GB Red Dragon | HIS HD5670 1GB IceQ | Vega 3
Storage 256GB SSD (OS) + 512GB SSD (Games) + 500GB + 2TB + 4TB | 80GB + 320GB | 128GB NVME
Display(s) Asus VN247H-P | KVM USB Switch | 15.6" FHD
Case Antec ONE | Generic Black
Audio Device(s) on board + Logitech Z623 | on board | on board
Power Supply Cooler Master GX-650 | Antec VP-450
Mouse MS Wired Desktop 600
Keyboard MS Wired Desktop 600
Software Win 10 x64 Pro | XCP-ng 8.1: XOA, pfSense, RouterOS, FreeNAS, Zabbix | Win 10 x64 Home
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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