Re: Unable to see Windows server due to route problem

[John Wunderlich]

Henrik Gemal <henri...@gmail.com> wrote in
news:092978d6-3a52-47df...@n4g2000vba.googlegroups.com
:

> I have a Windows 2003 server which has a route problem. I'm trying
> to connect to it from another server which is on IP 87.237.211.107
> and I'm getting host unreachable.
>
> I'm told that this is due to some route problems on the Windows
> 2003 server. I'm running OpenVPN at the server too.
>
> The route table on the Windows 2003 server looks like:
>
> IPv4 Route Table
> ===================================================================
> ======== Interface List
> 0x1 ........................... MS TCP Loopback interface
> 0x2 ...00 ff 29 54 bc dd ...... TAP-Win32 Adapter V9
> 0x10004 ...00 30 48 42 f2 39 ...... Intel(R) PRO/1000 MT Network
> Connection
> 0x10005 ...00 30 48 42 f2 38 ...... Intel(R) PRO/1000 MT Network
> Connection #2
> ===================================================================
> ===================================================================
> ======== Active Routes:
> Network Destination Netmask Gateway Interface Metric
> 0.0.0.0 0.0.0.0 87.237.208.1 87.237.213.28 20
> 10.4.0.0 255.255.255.0 10.4.0.1 10.4.0.1 30
> 10.4.0.1 255.255.255.255 127.0.0.1 127.0.0.1 30
> 10.255.255.255 255.255.255.255 10.4.0.1 10.4.0.1 30
> 87.237.208.0 255.255.248.0 87.237.213.28 87.237.213.28 20
> 87.237.213.28 255.255.255.255 127.0.0.1 127.0.0.1 20
> 87.255.255.255 255.255.255.255 87.237.213.28 87.237.213.28 20
> 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
> 224.0.0.0 240.0.0.0 10.4.0.1 10.4.0.1 30
> 224.0.0.0 240.0.0.0 87.237.213.28 87.237.213.28 20
> 255.255.255.255 255.255.255.255 10.4.0.1 10.4.0.1 1
> 255.255.255.255 255.255.255.255 87.237.213.28 87.237.213.28 1
> 255.255.255.255 255.255.255.255 87.237.213.28 10004 1
> Default Gateway: 87.237.208.1
>
> -----------------------------------
>
> The problem seems to be with the line:
> 87.237.208.0 255.255.248.0 87.237.213.28 87.237.213.28 20
>
> and I have no idea where it comes from. I've looked at the regedit and
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\PersistentRoutes
> is empty
>
> Help...
>

The line that you say is the "problem" is the line that defines your
local subnet. It is created dynamically when your IP address is
assigned. According to this line, your subnet mask is 255.255.248.0.
This would place your target address 87.237.211.xxx in the same
subnet as you are, so using a router isn't necessary and therefore
your machine attempts to talk directly to the target machine. My
bet is that your subnet mask really should be 255.255.255.0. The
subnet mask is set either by your DHCP server or in the TCP/IP
Properties (if you have manual IP addressing), so look there for a
misconfiguration.

HTH,
John