Topic: various dns/ping issues

[John Helms]

I have several customers in my area using E-Smith. Lately I am running into an unusual problem involving connectivity. Let me see if I can accurately paint the correct picture of the problem.
All of my current customers are using the same ISP and the same DSL provider. (2 different entities)
Of of the customers DSL static IP addresses are in the same range, lets say 207.22.145.2 thru 254.
All of the customers have registered domains.
All of the customers are using either 4.0 or its upgrade.
All of the customers can see any address out on the internet.
Some of the customers cannot see eachothers domains in the DSL IP address range, nor can they ping eachother, nor send email to eachother, nor see their webpages.
A few can see eachother.
Here is a traceroute performed from my DSL connection at home of some of the customers systems. BTW I am also using the same ISP and DSL provider as the customers and am in the same IP range.

[root@me]# traceroute 207.22.145.26
traceroute to 207.23.145.26 (208.23.146.26), 30 hops max, 38 byte packets
 1  e-smith.e-smith.208.23.146.101 (192.168.1.20)  0.437 ms  0.313 ms  0.255 ms
 2  * * *
 3  * * *

This will just go on and on and is the same for each customers system.
A ping will not be able to receive a response.
All of this of course makes communication between customers sites impossible even though they can see the general internet just fine.
Anyone out there have any ideas?

[Darrell May]

Are your subnet addresses different by chance?  Same IP range but different subnets would explain what you are noticing.

Regards,

Darrell

[John Helms]

No, subnets are the same for all customers. Last night I ran some pings and tests with a friend who is on a different service. It appears that everything is stopping at the router used by the ISP for DSL their DSL customers. I am thinking misconfigured router. The odd thing is it is not consistent from one location to another. From my home for instance I cannot ping or traceroute anyone in this IP range. From my office I can reach some, but not all. From another customers site, I cannot ping anything in this IP range and so on. Of course the ISP is blaming the phone company and the phone company is blaming the ISP. (ping pong ping pong) I have tested the servers we have setup and they all appear to be working fine. Anyone out there know of any possible bugs that may cause this. I really don't think its a bug but hey, at this point anything sounds good.