Localhost / ISP Question

Microsoft Windows xp pro w/ sp3 multilin...
November 13, 2009 at 08:21:46
Specs: Windows XP
Hi there. I'm new to these forums, but I hope to
make some contributions in the future!

My question is the following:

I'm trying to set up a network in my house,
and I was sniffing my traffic using Wireshark
the other day, and I saw the origin of my traffic

Now, I'm a little confused on this. Does
Comcast see my computer name everytime I
connect to the internet, or simply my IP
address? Why is Wireshark pulling up
mycomputer name and placing it with the
HSD1 Comcast server?

Or is it an entirely internal matter? Please
explain, thanks!

See More: Localhost / ISP Question

Report •

November 13, 2009 at 09:46:23
Depands, are you inside the NAT when you are running your WinPCap? Is this a Windows Box or Linux? If so you are probably just picking up the NetBios packets that Windows just loves to give out. The Firewall should block these packets from getting out to the WAN. I am assuming you have a NAT and a Firewall because most routers come with this built in. Just go into your NIC and the TCP/IP stack and turn off the NetBios or block port 137-139 on your firewall to drop these packets.

"(mycomputername).hsd1.fl.comcast.net" as the host address is a little concerning though because it says that you are on their Domain.

Can you give us a little bit about how your network is setup like do you have a Router with NAT and DHCP built in?
Can you do a IPCONFIG /displaydns and post the results?

As long as the resolved address is either 192.168.x.x, 172.x.x.x or 10.x.x.x then you should be fine because these are not routeable addresses.

Report •

November 13, 2009 at 14:18:12
Let's start with some basics. Last years hacker fest took less then 20 minutes to take control of each major OS all with latest patches. You should not expect a computer attached to the internet to be secure.

The second part is reduce exposure to the threat. Consider a soho router/firewall device. If setup correctly it tends to limit access to your lan and computer.

Playing to the angels
Les Paul (1915-2009)

Report •

Related Solutions

Ask Question