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Windows XP SP2 and zero subnet routing.have setup the PIX with an internal IP address of 10.0.0.1/16 (255.255.0.0), which is obviously setup on the "zero subnet". My Windows XP computer (Home Edition) was setup with an IP address of 10.0.0.2, def. gw. 10.0.0.1. Everything was working fine until I installed SP2 on it. After doing that, I was not even able to get to the PIX Firewall at all! I went ahead and changed the IP addresses of both devices (Firewall and computer) to 10.1.0.1 and 10.1.0.2, respectively, so they don't belong to the "zero subnet", and everything went back to normal. So, this is obviously a problem that Windows XP SP2 has routing to a "zero subnet". I tried other Windows machines (98, 2003 Server, XP SP1-downgraded mine-), and they all worked perfectly if I would set their IPs on the zero subnet. All of them but the one with XP SP2!!! :0( I was wondering if any of you have heard about this kind of problem, and if so, how to resolve it! Thanks, Federico.
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"Federico." <Federi***@discussions.microsoft.com> wrote in message I'm afraid it works OK here.news:7D5376D7-C225-4FF7-BFEA-9620D84A1784@microsoft.com... >I have a small PIX Firewall (PIX-501), which I use to play around with. I > have setup the PIX with an internal IP address of 10.0.0.1/16 > (255.255.0.0), > which is obviously setup on the "zero subnet". My Windows XP computer > (Home > Edition) was setup with an IP address of 10.0.0.2, def. gw. 10.0.0.1. > Everything was working fine until I installed SP2 on it. After doing that, > I > was not even able to get to the PIX Firewall at all! I went ahead and > changed > the IP addresses of both devices (Firewall and computer) to 10.1.0.1 and > 10.1.0.2, respectively, so they don't belong to the "zero subnet", and > everything went back to normal. > > So, this is obviously a problem that Windows XP SP2 has routing to a "zero > subnet". I tried other Windows machines (98, 2003 Server, XP > SP1-downgraded > mine-), and they all worked perfectly if I would set their IPs on the zero > subnet. All of them but the one with XP SP2!!! :0( > > I was wondering if any of you have heard about this kind of problem, and > if > so, how to resolve it! > > Thanks, > > Federico. Here's a screen-dump of me on an XP-home SP2 machine which I set up with a static IP address of 10.0.0.2, subnet mask 255.255.0.0. I'm pinging another machine on 10.0.0.1: Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\Documents and Settings\Ron>ipconfig Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 10.0.0.2 Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : 10.0.0.1 C:\Documents and Settings\Ron>ping 10.0.0.1 Pinging 10.0.0.1 with 32 bytes of data: Reply from 10.0.0.1: bytes=32 time=24ms TTL=128 Reply from 10.0.0.1: bytes=32 time=9ms TTL=128 Reply from 10.0.0.1: bytes=32 time=9ms TTL=128 Reply from 10.0.0.1: bytes=32 time=4ms TTL=128 Ping statistics for 10.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 4ms, Maximum = 24ms, Average = 11ms C:\Documents and Settings\Ron> So there's no problem routing the zero subnet. It's something else. -- Best Regards Ron Lowe MVP - Windows Networking
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"Ron Lowe" <ron-msng@{d.e.l.e.t.e}lowe-family.me.uk> wrote in message turn off XP's internal firewallnews:OyzfJpMcFHA.456@TK2MSFTNGP09.phx.gbl... > "Federico." <Federi***@discussions.microsoft.com> wrote in message > news:7D5376D7-C225-4FF7-BFEA-9620D84A1784@microsoft.com... >>I have a small PIX Firewall (PIX-501), which I use to play around with. I >> have setup the PIX with an internal IP address of 10.0.0.1/16 >> (255.255.0.0), >> which is obviously setup on the "zero subnet". My Windows XP computer >> (Home >> Edition) was setup with an IP address of 10.0.0.2, def. gw. 10.0.0.1. >> Everything was working fine until I installed SP2 on it. After doing >> that, I >> was not even able to get to the PIX Firewall at all! I went ahead and >> changed >> the IP addresses of both devices (Firewall and computer) to 10.1.0.1 and >> 10.1.0.2, respectively, so they don't belong to the "zero subnet", and >> everything went back to normal. >> >> So, this is obviously a problem that Windows XP SP2 has routing to a >> "zero >> subnet". I tried other Windows machines (98, 2003 Server, XP >> SP1-downgraded >> mine-), and they all worked perfectly if I would set their IPs on the >> zero >> subnet. All of them but the one with XP SP2!!! :0( >> >> I was wondering if any of you have heard about this kind of problem, and >> if >> so, how to resolve it! >> >> Thanks, >> >> Federico. > > > I'm afraid it works OK here. > Here's a screen-dump of me on an XP-home SP2 machine > which I set up with a static IP address of 10.0.0.2, subnet mask > 255.255.0.0. > I'm pinging another machine on 10.0.0.1: > > Microsoft Windows XP [Version 5.1.2600] > (C) Copyright 1985-2001 Microsoft Corp. > > C:\Documents and Settings\Ron>ipconfig > > Windows IP Configuration > > > Ethernet adapter Local Area Connection: > > Connection-specific DNS Suffix . : > IP Address. . . . . . . . . . . . : 10.0.0.2 > Subnet Mask . . . . . . . . . . . : 255.255.0.0 > Default Gateway . . . . . . . . . : 10.0.0.1 > > C:\Documents and Settings\Ron>ping 10.0.0.1 > > Pinging 10.0.0.1 with 32 bytes of data: > > Reply from 10.0.0.1: bytes=32 time=24ms TTL=128 > Reply from 10.0.0.1: bytes=32 time=9ms TTL=128 > Reply from 10.0.0.1: bytes=32 time=9ms TTL=128 > Reply from 10.0.0.1: bytes=32 time=4ms TTL=128 > > Ping statistics for 10.0.0.1: > Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), > Approximate round trip times in milli-seconds: > Minimum = 4ms, Maximum = 24ms, Average = 11ms > > C:\Documents and Settings\Ron> > > So there's no problem routing the zero subnet. > It's something else. > > -- > Best Regards > Ron Lowe > MVP - Windows Networking > > Definately worth a try.> turn off XP's internal firewall > The firewall *should* not prevent you pinging out from the firewalled PC. It will permit replies to outbound traffic. Of course, the firewall could be broken. -- Show quoteHide quoteBest Regards Ron Lowe MVP - Windows Networking >> Hey guys!
Thanks for the replies... Here is the strange thing: I do know that the internal firewall was turned off and the other firewall was not broken. With Windows XP SP2, another network (i.e., 10.1.0.0/16), no changes at all but the IP address, I could ping both ways! Changed the other firewall IP back to 10.0.0.0/16 network, using another machine, different OS, it works! So, it is not the other firewall :0(... The only way it does not work is if the machine has XP SP2! Ran sniffer on the other firewall (computer directly attached to it), and don't see a single packet coming out of my machine! Of course, I am not running XP SP2 anymore, I just wanted to see if anyone had seen anything similar. Thanks again! ~federico. Show quoteHide quote "Ron Lowe" wrote: > > > > turn off XP's internal firewall > > > > > Definately worth a try. > > The firewall *should* not prevent you pinging out from the firewalled PC. > It will permit replies to outbound traffic. > > Of course, the firewall could be broken. > > -- > Best Regards > Ron Lowe > MVP - Windows Networking > >> > > > 
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