Very strange ftp problems through 1700 router.

Very strange ftp problems through 1700 router.
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Subject Author Date
Very strange ftp problems through 1700 router. drstrangenorm 08-14-2005
Posted by on August 14, 2005, 2:12 pm
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I have a static nat translation setup to allow the FTP service from
outside to inside. This seems to work perfectly fine for a
undetermined and seemingly random ammount of time. Then without
warning it will stop allowing ftp communications. The only way to fix
it is to take out the static mapping and put it in again, or to reboot
the router.

This is a very hard to solve problem for me because we have other
static mappings on addresses on the router that work perfectly fine and
never drop connections.

The ftp server is an IIS ftp server if that has anything to do with it.
The router also allows VPN connection in. I am just wondering if any
of the experts hopefully reading this forum have any suggestions!

Thanks.



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Posted by Paul on August 14, 2005, 5:46 pm
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drstrangenorm@gmail.com wrote:
> I have a static nat translation setup to allow the FTP service from
> outside to inside. This seems to work perfectly fine for a
> undetermined and seemingly random ammount of time. Then without
> warning it will stop allowing ftp communications. The only way to fix
> it is to take out the static mapping and put it in again, or to reboot
> the router.
>
> This is a very hard to solve problem for me because we have other
> static mappings on addresses on the router that work perfectly fine and
> never drop connections.
>
> The ftp server is an IIS ftp server if that has anything to do with it.
> The router also allows VPN connection in. I am just wondering if any
> of the experts hopefully reading this forum have any suggestions!
>
> Thanks.
>
Are you by any chance limiting 'max-entries' for nat on this router?


Posted by on August 24, 2005, 8:25 am
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Nope, I am not doing any such thing. I am thinking about using a
different ftp server program just to see if maybe the ftp program
itself is sending goofy packets causing it to mess w/ the router. I
doubt it, but at this point it is worth a shot.



Posted by RobO on August 24, 2005, 8:46 am
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Hi,

Are you using any sort of protocol inspection features on the router?
What is the IOS, feature set you are using?
Try using another ftp server and see if it happens again like you said
to rule out either or.
Then if it does the same thing post your config.

Rob



Posted by on September 13, 2005, 8:21 am
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No not yet. I havent been able to go out and solve it because my
customer stopped paying the bills. I might get to go repo the servers
:) If they pay the bill and I work on it and figure out a fix I'll let
you know.



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