169.254.0.0 and Zone Alarm

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Re: 169.254.0.0 and Zone Alarm

"Sandi" wrote in message
news:9617B04698BD74C1H4@194.168.222.125...
> My PC is connected to the Net via cable and there are no other PCs
> attached.
>
> I left my PC to do some P2P downloading. When I got back Zone Alarm
> said it had detect a new Private Network with an IP address of
> 169.254.0.0.
>
> The screen had frozen and I had to do a reboot. On rebboting Zone
> Alarm didn't ask about 169.254.0.0 again.
>
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

Pasted from: http://www.howtonetworking.com/ipconfig.htm#Why

Symptom: The Internet Assigned Numbers Authority (IANA) has reserved
169.254.0.0-169.254.255.255 for Automatic Private IP Addressing. If the
computer can't get ip from DHCP, APIPA provides an address that is
guaranteed not to conflict with routable addresses.

Re: 169.254.0.0 and Zone Alarm

"Sandi" wrote in message
news:9617B04698BD74C1H4@194.168.222.125...
> My PC is connected to the Net via cable and there are no other PCs
> attached.
>
> I left my PC to do some P2P downloading. When I got back Zone Alarm
> said it had detect a new Private Network with an IP address of
> 169.254.0.0.
>
> The screen had frozen and I had to do a reboot. On rebboting Zone
> Alarm didn't ask about 169.254.0.0 again.
>
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

Pasted from: http://www.howtonetworking.com/ipconfig.htm#Why

Symptom: The Internet Assigned Numbers Authority (IANA) has reserved
169.254.0.0-169.254.255.255 for Automatic Private IP Addressing. If the
computer can't get ip from DHCP, APIPA provides an address that is
guaranteed not to conflict with routable addresses.

Re: 169.254.0.0 and Zone Alarm

On Sat, 12 Mar 2005 17:19:01 GMT, Sandi wrote:

>My PC is connected to the Net via cable and there are no other PCs
>attached.
>
>I left my PC to do some P2P downloading. When I got back Zone Alarm
>said it had detect a new Private Network with an IP address of
>169.254.0.0.

This means that your PC lost its internet connection, and was unable
to get an IP address. Any 169.x.x.x address is only assigned when all
else fails and your Pc can't find your ISPs server.

From ZA's point of view, its completely harmless. From your point of
view, it means your internet connection fell over. You may want to
explore why.

Re: 169.254.0.0 and Zone Alarm

On Sat, 12 Mar 2005 17:19:01 GMT, Sandi wrote:

>My PC is connected to the Net via cable and there are no other PCs
>attached.
>
>I left my PC to do some P2P downloading. When I got back Zone Alarm
>said it had detect a new Private Network with an IP address of
>169.254.0.0.

This means that your PC lost its internet connection, and was unable
to get an IP address. Any 169.x.x.x address is only assigned when all
else fails and your Pc can't find your ISPs server.

From ZA's point of view, its completely harmless. From your point of
view, it means your internet connection fell over. You may want to
explore why.

Re: 169.254.0.0 and Zone Alarm

Sandi wrote:

> My PC is connected to the Net via cable and there are no other PCs
> attached.
>
> I left my PC to do some P2P downloading. When I got back Zone Alarm
> said it had detect a new Private Network with an IP address of
> 169.254.0.0.
>
> The screen had frozen and I had to do a reboot. On rebboting Zone
> Alarm didn't ask about 169.254.0.0 again.
>
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

This is a non routable IP address similar to 10.x.x.x and 172.16-172.31 and
192.168.x.x. Windows will also default to it if it can not get an IP
address....

Michael

Re: 169.254.0.0 and Zone Alarm

Sandi wrote:

> My PC is connected to the Net via cable and there are no other PCs
> attached.
>
> I left my PC to do some P2P downloading. When I got back Zone Alarm
> said it had detect a new Private Network with an IP address of
> 169.254.0.0.
>
> The screen had frozen and I had to do a reboot. On rebboting Zone
> Alarm didn't ask about 169.254.0.0 again.
>
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

This is a non routable IP address similar to 10.x.x.x and 172.16-172.31 and
192.168.x.x. Windows will also default to it if it can not get an IP
address....

Michael

Re: 169.254.0.0 and Zone Alarm

In ntl.discussion.broadband.cm Sandi wrote:
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

Have a look at RFC3330

http://www.ietf.org/rfc/rfc3330.txt


Andy

Re: 169.254.0.0 and Zone Alarm

In ntl.discussion.broadband.cm Sandi wrote:
> WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
> address it is?

Have a look at RFC3330

http://www.ietf.org/rfc/rfc3330.txt


Andy

Re: 169.254.0.0 and Zone Alarm

Sandi skrev i meldingen <9617B04698BD74C1H4@194.168.222.125>...
>My PC is connected to the Net via cable and there are no other PCs
>attached.
>
>I left my PC to do some P2P downloading. When I got back Zone Alarm
>said it had detect a new Private Network with an IP address of
>169.254.0.0.
[...]
>WHOIS tells me nothing about 169.254.0.0. Does anyone know what IP
>address it is?

Most likely, Mark MacIntyre is right, your internet connection dropped and
your computer got a self assigned address, which ZA identified as "alien".

Possibly, it is an external intrusion attempt: Do you have wireless
networking? Your network may be subject to exploitation from neighbours. If
you don't have DHCP in your network, those "external" connections will keep
their IP, which is likely to be self assigned as well, and within the same
subnet.

WLAN users may want to explore some security issues. To get some starting
points, search the web for "WLAN security", "WEP", "WiFi", "War driving",
"SSID broadcast", "VPN", "MAC address filter" and "packet sniffer".