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Offlinedebianlinux
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WinXP ICF (firewall) Problem
    #1874056 - 09/02/03 12:34 PM (20 years, 8 months ago)

Here is the scenario:

2 WinXP machines attached to 1 switch attached to 1 router attached to DSL Modem. Router IP: 192.168.1.1 WinXPM1 IP: 192.168.1.101 WinXPM2 iP: 192.168.1.102. Gateway is 192.168.1.1. Internet access remains consistent regardless of ICF state (on or off). Connectivity between the 2 computers, however, is available with ICF disabled but not available with ICF enabled. What gives?

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Offlinedebianlinux
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Re: WinXP ICF (firewall) Problem [Re: debianlinux]
    #1874060 - 09/02/03 12:37 PM (20 years, 8 months ago)

meh, FYI, the solution was to map the drive. makes sense but not really.... the share should work across the firewall assuming the proper permissions are given. ICF is pretty limited in configurablity... about what one would expect Gates to offer.

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Offlinedebianlinux
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Re: WinXP ICF (firewall) Problem [Re: debianlinux]
    #1874078 - 09/02/03 12:46 PM (20 years, 8 months ago)

actually, i still have th eproblem. once the firewall is up no new shares can be made and trying to do so will disconnect the previously working shares. ICF literally hides the two computers from each other. BTW, they are both in the same workgroup.

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InvisiblePjS
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Re: WinXP ICF (firewall) Problem [Re: debianlinux]
    #1874156 - 09/02/03 01:13 PM (20 years, 8 months ago)

Why not do the packet filtering on the router, or install another software firewall (like Kerio) that isn't so stupid to configure as ICF?


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Offlinedebianlinux
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Re: WinXP ICF (firewall) Problem [Re: debianlinux]
    #1874170 - 09/02/03 01:15 PM (20 years, 8 months ago)

Here is an interesting read on the subject at hand. This is the meat of it:

ICF blocks all unsolicited incoming traffic (but ignores outgoing traffic, which means a virus that sends information from an infected machine isn't stopped). Because the firewall doesn't differentiate between incoming traffic from the Internet and incoming traffic from other nodes on the LAN, ICF and networks don't play well together. No other computer on the network can access a computer that's running ICF. (You can configure ICF to open certain ports for specific operating-system services, but the process is complicated even for a knowledgeable user.)

One way to overcome the access problem caused by this primitive firewall is to use two network cards in the PC that is managing the broadband Internet connection sharing (usually the default setup for cable modems). One NIC connects to the cable or DSL modem and has ICF enabled. The other, connected to your network, has ICF disabled.

Another alternative, if the networked computers and the modem are all plugged into the same hub, is to install a protocol other than TCP/IP for home networking. NetBEUI is available on all the earlier consumer versions of Windows and takes only a few clicks to install. Windows XP doesn't list NetBEUI as an available protocol, but the Windows XP CD has the files you need in the Valueadd\MSFT\Net\NetBEUI subfolder. Copy Nbf.sys to the Windows\System32\Drivers folder and copy Netnbf.inf to the Windows\Inf folder. In the Control Panel, open Network Connections and then the Properties dialog for the network card. On the General tab, choose Install | Protocol | Add, and then select NetBEUI as the new protocol. ICF will continue to block TCP/IP traffic, but NetBEUI will handle local network communications.

The best option is to disable ICF and purchase a router with a built-in firewall or install a third-party firewall, such as Norton Internet Security 2002 or Sygate Personal Firewall PRO 4.2. You can configure these firewalls to allow access by other computers on the network


I've got a router with a firewall but I was hoping to use ICF to keep my machine quiet during scans and such. Anybody think the NetBEUI appraoch is worthwhile?

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OfflineSeussA
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Re: WinXP ICF (firewall) Problem [Re: debianlinux]
    #1874354 - 09/02/03 02:04 PM (20 years, 8 months ago)

I have installed the NetBEUI for XP to get XP to work with older NT servers. I don't think it will fix your problem, but I am not familiar with ICF. It sounds like ICF is blocking the broadcast packets that windows uses for discovery of available network services.

The real solution is to turn off ICF and put a hardware firewall between your internal network and the rest of the world. Software firewalls suck, regardless of who makes them. If Micro$oft wrote it, then it sucks even more. Both netopia and sonicwall make decent and cheap hardware solutions. The cisco pix 501 isn't bad, but is expensive and complex to configure beyond the 'out of box' setup.



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