On May 16, 2011, at 9:51 AM, Wietse Venema wrote:
> jason hirsh:
>> 08:40:31.036997 IP mail-iy0-f182.google.com.51101 >
>> tuna.theoceanwindow-bv.com.smtp: Flags [S], seq 850119283, win 5720,
>> options [mss 1430,sackOK,TS val 2972295960 ecr 0,nop,wscale 6], length 0
>
> So, you are receiving connection attempts from a Google system
> mail-iy0-f182.google.com. This has IP address 209.85.210.182.
>
> I also notice that tuna.theoceanwindow-bv.com has an IP address
> of 209.160.65.133.
>
> What is the output of
>
> ifconfig -a | grep 209.160
inet 209.160.65.133 netmask 0xfffff800 broadcast 209.160.71.255
(this is the IP handling mail services)
inet 209.160.68.112 netmask 0xff000000 broadcast 209.255.255.255
>
> If the netmask is mis-configured (say, 0xff000000) then that explains
> why we see no responses to connection attempts from 209.85.210.182
> (and other 209.* IP addresses).
>
> The reason is that your machine is sending out ARP requests to the
> local subnet for 209.85.210.182. Of course it gets no response,
> and therefore it never replies to connection attempts from that IP
> address.
>
> FYI this means that no-one in 209.* would be able to connect to
> your web server as well.
I am more then a little confused in that I have in fact received mail from that
google server
an example from message header is
"Received: from mail-gw0-f54.google.com (mail-gw0-f54.google.com
[74.125.83.54]) by tuna.theoceanwindow-bv.com (Postfix) with ESMTP id 11AB65C23
for <[email protected]>; Sat, 14 May 2011 22:37:41 -0400 (EDT)"
>
> Wietse
