Cygwin/X XDMCP Issue

[Michael DePaulo]

On Sun, Feb 22, 2015 at 4:38 PM, Maarten Hoes <hoes.maarten@gmail.com> wrote:
>
>
> On 22-2-2015 22:09, Maarten Hoes wrote:
>>
>>
>> 28   1.690209 192.168.0.21 -> 192.168.178.20 TCP 74 60221â+'6000 [SYN]
>> Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=6862378 TSecr=0 WS=128
>
> Wait, what ? send to 192.168.178.20 instead of 192.168.0.20 ? i changed the
> ip address range of my home network. thats whats wrong, now i guess i need
> to figure out where i forgot to update that ip range / address.
>
> Oh, well.

I can think of 2 possible issues/solutions:

With XDMCP under VcXsrv or Cygwin XWin, you often need to use this
argument to, usually when you have multiple (virtual) network
adapters:
-from 192.168.0.20

XDMCP involves a forward-confirmed reverse DNS lookup. So if you have
incorrect DNS records like the following:
PTR: 192.168.0.20 -> windows-pc
A:   windows-pc -> 192.168.178.20
Then this problem will happen.

-Mike

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