[ale] routing port forwarding issues - help!

[Gary MacKay]

A traceroute will die before it gets to the desired machine. Traceroute 
dies at the same IP addr from each machine that I tried it from.

New info: I found that I can telnet to port 25 just fine from the 
firewalls of each lan. As I mentioned below, one is a Netopia R910 
router, one is an OpenBSD box running ipf, and one is a Linksys 
router/hub unit. In each case, I can telnet just fine from the firewall, 
but not from the qmail server behind it. I can also telnet just fine 
from any _other_ machine, windows and linux, behind the firewall. Just 
not from the qmail box which is involved in the port forwarding rules 
from the firewall.

What could port forwarding have to do with it? That seems to be the only 
common thing so far.

- Gary




Dow Hurst wrote:
> What is the result from a traceroute for these machines that don't 
> respond to a  telnet to port 25?  Do you know whether the  other 
> machines that you can get to on these LANs will respond to a port 25 
> telnet?
> Dow
> 
> 
> Gary MacKay wrote:
> 
>> I have several email servers running qmail at various clients and can 
>> not send messages to certain domains. Most email works just fine, but 
>> I am seeing a growing number of domains that I can not send to.
>>
>> I do not think my problems are related to qmail tho. I think it is 
>> more of a routing, firewall, etc. type issue. Reason is I can not even 
>> telnet to the IP addr on port 25 of the domains that are failing. I'm 
>> not sure how the firewall fits into the picture either since they are 
>> different at each site (ie. Netopia, Linksys, and OpenBSD). Obviously 
>> they are all doing NAT and port forwarding to/from the email server 
>> inside. Very typical/standard setup I'm sure.
>>
>> At first I thought it had to do with the ISP, since all of the ones 
>> with problems, use the same ISP. That is the only common factor I 
>> could find. Then I discovered yesterday that I could telnet just fine 
>> from other machines on the network, just not the email server. 
>> Windows, Linux, etc,. Did not matter. Very weird. I checked this at 
>> the other client sites, and sure enough, it works from any machine 
>> other than the mail server. What am I missing here?
>>
>> TIA,
>> - Gary
>>
>>
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> 
> 
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