Cannot run behind router

Cannot run behind router
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Subject Author Date
Cannot run behind router cell 12-11-2007
Posted by cell on December 11, 2007, 11:54 pm
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Dear all,

I have made 2 network devices which are OK to communicate with PC. The
connection configuration is that the PC and the 2 devices are
connected to an LAN switch. I have written a program which can connect
to any one of the 2 devices without problem.

However, actually I want to put the devices behind a router which is
connected to the WAN. The router configuration is OK as I can use it
to browse web pages without problem.

However, my program cannot communicate with the devices when they are
plugged into the router.

I have already set port forwarding in the router so that ports are
forwarding to corresponding devices with different internal IPs.

Do anyone has any idea about my problem?

Thanks!














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Posted by Robert Redelmeier on December 12, 2007, 8:44 am
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> However, my program cannot communicate with the devices
> when they are plugged into the router.

Do they have static IPs when the router expects to
allocate IPs by DHCP? It might not pass these packets
unless configured to be aware of the statics.

-- Robert


Posted by cell on December 12, 2007, 11:14 pm
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On 12$B7n(B12$BF|(B, $B2<8a(B9$B;~(B44$BJ,(B, Robert Redelmeier
>
> > However, my program cannot communicate with the devices
> > when they are plugged into the router.
>
> Do they have static IPs when the router expects to
> allocate IPs by DHCP? It might not pass these packets
> unless configured to be aware of the statics.
>
> -- Robert

The DHCP is disabled when checking the router configuration.

Posted by Robert Redelmeier on December 14, 2007, 11:47 am
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> The DHCP is disabled when checking the router configuration.

OK, but the IP addresses might need to be "reasonable"
forthe router to pass traffic.

It might be easiest and quickest just to plug all devices
into your switch, then plug the switch into your router.
Such cascades are normal. Or you might just have a dead port
on the router.

-- Robert




Posted by Rich Seifert on December 12, 2007, 10:32 am
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In article

> Dear all,
>
> I have made 2 network devices which are OK to communicate with PC. The
> connection configuration is that the PC and the 2 devices are
> connected to an LAN switch. I have written a program which can connect
> to any one of the 2 devices without problem.
>
> However, actually I want to put the devices behind a router which is
> connected to the WAN. The router configuration is OK as I can use it
> to browse web pages without problem.
>
> However, my program cannot communicate with the devices when they are
> plugged into the router.
>

Have you written your program to communicate through the IP stack, or
does it interface directly to the LAN device driver? Only IP packets
will be forwarded through an IP router.


--
Rich Seifert Networks and Communications Consulting
21885 Bear Creek Way
(408) 395-5700 Los Gatos, CA 95033
(408) 228-0803 FAX

Send replies to: usenet at richseifert dot com

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