new Network found ... but I do not recognize it...

Comodo Internet Security - CIS Firewall Help - CIS
#1

Hello,
My system reported a new Network and asked me if this is a home or public network.
Problem is, that I have no idea where this new network is coming from …

The got a new PC and connected it to my home network which is 192.168.xxx.xxx Addresses.
The new network that is found is 169.254.12.162/17 (whatever the /17 at the end means).

If I ping this address the result is also somehow strange:
C:\Users\Hermann>ping 169.254.15.162

Ping wird ausgeführt für 169.254.15.162 mit 32 Bytes Daten:
Antwort von 192.168.xxx.27: Zielhost nicht erreichbar.
Antwort von 192.168.xxx.27: Zielhost nicht erreichbar.
Antwort von 192.168.xxx.27: Zielhost nicht erreichbar.
Antwort von 192.168.xxx.27: Zielhost nicht erreichbar.

Ping-Statistik für 169.254.15.162:
Pakete: Gesendet = 4, Empfangen = 4, Verloren = 0
(0% Verlust),

it says the answer from the PC with my local IP (.xxx.27) and the target host is not reachable (Zielhost nicht erreichbar).
But it says also received (Empfangen) =4 … and 0% lost packages …

Can anybody explain this data ?

#2

It seems 169.254.x.x adresses are given when a PC can’t properly obtain IP adress (DHCP problems parhaps.)

Also, 169.254.12.162/17 type ranges belong to Ipv6 … but I’m not entirely sure.

#3

As Maniak2000 suggested, addresses from this range are allocated by the OS, when a DHCP server cannot be contacted, even temporarily. The process is called APIPA or zero configuration networking. For IPv4 the address blocks used are - 169.254.0.0/255.255.0.0. IPv6 uses a similar process, although it’s a little more complicated. As yet, CIS doesn’t have the facility to deal IPv6 in this way.

#4

Thanks,
that was the issue. It seems my DHCP had a short problem, and of course the Firewall found the new network. When I started investigating the DHCP was working again, and my system had the normal IP…

Thanks for sharing your Knowledge …

Hermann