On Wed, 2012-08-29 at 19:47 -0500, Dale Dellutri wrote:
On Wed, Aug 29, 2012 at 2:40 PM, Arthur Dent
<misc.lists(a)blueyonder.co.uk> wrote:
>...
> So here's the thing - and I don't remember having this problem with F15
> (or previous):
> I can access my mail using a client on another machine in my network if
> I configure it to use 192.168.2.2, but for my mobile devices I configure
> the email client to point to
example.org. If I am outside of my network
> they can access mail fine, but if I am at home and they are connecting
> via my own wi-fi... no joy...
It looks like it has something to do with your home router. It seems to
be having trouble routing packets which are meant for itself but coming
from inside the lan.
Do you have a SOHO router on your lan (separate from your server), or
is your home server also doing the NAT/NPT routing for your lan?
When your mobile is at home, it has an IP addr on your lan: 192.168.2.6
for example. When it sends something to example.org:993, it first uses
DNS to change it to an IP addr: 123.456.789.123 in your example. Then
it sends the request to the router to get to the internet. But that's the
router's own IP addr (because it IS
example.org). So the router ought to
just use the request internally and deal with it correctly.
If you have a separate SOHO router did it change lately?
If your home server is the router, then, of course, it has changed, and
something isn't working properly. However, I can't help you any further
because I've never used a server as a router for a lan.
(But note that your iptables output shows rules in the FORWARD chain,
but no packet traffic (those zeroes at the beginning of each line).)
Hmmm....
I am still somewhat mystified. I have a Belkin F5D8233-4v3 wireless
router which has not (as far as I know) been altered since I set it up
3-4 years ago.
With all previous versions of Fedora it "just worked". Poking around in
the settings I can see no option specifically to turn on or off NAT.
However, whilst in there I decided to "reboot" the router. That *seems*
to have done the trick.
I am not wholly satisfied yet however. My main mobile device is an Apple
iPhone 3GS. I find that now that I have rebooted the router I can
sometimes access my mail from within my network (and the iPhone
configuration obviously points to "example.org"), but with the standard
Apple email client I often get a "checking for mail" message with the
network activity icon rotating furiously, but no update of mail. Then
sometimes it will work. I did NOT have this problem before.
However, on the same phone I happen to have another email client
(ibisMail) which (with exactly the same settings) works just fine...
Since rebooting the router my wife's iPad also now seems to work fine.
So I guess it was the router that was the problem and rebooting it seems
to have fixed it. I need to look at my iPhone a bit more closely, but
for the moment I think we have have solved this.
Thank you to everyone who helped. I am not a newbie, but in many areas
(networking especially!) my level of expertise is woefully inadequate
and I really appreciate the helpful support I get from this mailing
list.
Mark