I have a bizarre problem that I hope someone may be able to give me a clue in
the right direction to solve.
Setup:
Work:
I have 3 Linux-MDK8.0 PC's on my desk at work. All connected to same
switch. A,B,C all have public static IP's can all ping each other and ssh
into each other.
Home:
I have a 4th MDK8.0 computer, "D", at home with a publc static IP over an
ADSL connection.
Symptom:
A,B,C can all ping and ssh into D.
When I go home, D can not ping A,B,or C.
Bizarre:
If I leave a ping running from home for about 1.5 hours, A,B,C start
responding to my pings. If I close all ssh sessions and stop pinging for
approx 1 hour, and then try to ping from D again, the pings fail.
If I get one of A,B,C to respond from D, I can ssh into it from D, then ssh
to another computer of A,B,C, and then it will start responding to pings as
well.
Details:
PC "A" is a Dell machine i bought and put Win2k/Linux on.
PC's "B" and "C" are machines I built myself and have identical hardware.
As I always customize the install, they have slightly different software
loaded. They are running only Linux.
PC "D" I built myself and is different than the other computers. It is dual
boot Win2k/Linux.
Troubleshooting:
I replaced the existing Hub when the problem started with a new switch.
>From D, I can ping 2 different Windows 2000 computers connected to the same
switch in my office.
Port Sentry was initially disabling me so I removed it from all computers. I
want the problem to go away before I start more on security.
I cleared all /etc/hosts.allow /etc/hosts.deny entries.
I can't find any logs that show my pings being blocked, but I admit not
knowing everywhere to look.
I formatted/reinstalled Linux on all 3 computers at work.
I can telnet from home into an old Sparcstation at the switch at work and
ping A,B,C from it.
I've replaced all network cables at work with brand new ones. I know they
work because I can access the internet from A,B,C.
I've verified that A,B,C won't respond from an another external location
besides my home.
Help! I have to get these working. B,C will be web/email servers that won't
be much good if I can't ping them from outside my office.
Thanks to anyone who can help!
-Brian
