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Routing table dumb question

  • nieldm
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12 Mar 2023 10:06 #102302 by nieldm
Routing table dumb question was created by nieldm
Showing my total ignorance of what I am supposed to see in a routing table, but mine includes something I don't recognise and I want to be sure there's not something misconfigured somewhere. The table looks like this (WAN IP anonymised):

S 0.0.0.0/ 255.255.255.0 via 192.168.30.1 VPN-1
* 0.0.0.0/ 0.0.0.0 via 172.16.15.71 WAN1
S 86.129.X.X/ 255.255.255.255 via 86.129.X.X WAN1
C~ 192.168.1.0/ 255.255.255.0 directly connected LAN1
C 192.168.30.1/ 255.255.255.255 directly connected VPN-1
* 172.16.15.71/ 255.255.255.255 via 172.16.15.71 WAN1

What I don't understand is why there is a 172.16.X.X address in there as I don't use 172... anywhere. Is this 'expected behaviour'?

..and you may mercilessly rip the p1ss out of me if this gets dumb question of the day award.

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12 Mar 2023 14:55 #102303 by tomek
Replied by tomek on topic Re: Routing table dumb question
On mine the * (default route) corresponds to the gateway IP of my ISP (shown under Online Status > Physical Connection) except mine is a public IP. I don't know if that helps?

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  • nieldm
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12 Mar 2023 15:17 #102304 by nieldm
Replied by nieldm on topic Re: Routing table dumb question
I think I was being even dumber than I originally thought -it seems that 172.16.15.71 is the BT gateway address per my Online Status page. I was confused thinking that the 172 subnet is the same as the 192 subnet, ie for internal use as opposed to being an internet IP.

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13 Mar 2023 08:55 #102305 by tomek
Replied by tomek on topic Re: Routing table dumb question
Interesting that your gateway can be a private address. I guess I never considered that the connection between one’s router and ISP isn’t using the public internet.

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