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6 Posts
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6129
March 11th, 2008 13:00
IP problems
Hi maybe someone here can help me out.
Im a complete noob when it comes to networks, and I have the infortunate task of looking after my company one.
We have two power connect 2716's connected together in unmanaged mode, via port 16. Into these goes a SBS2003 server, 8 workstations, 6 PE 1950 and a few other things like laptops etc. Up till now I have no issues. But recently we have changed some of our software. One thing in particular uses licenses that need to be checked in and out. (being an animation company we have lots of licenses for everything, theres alot to manage)
This particular bit of software uses IP's and computer names to track who's checked a license out, etc.
This is where the error creeps in, several machines on the network are getting mangled IP's. ping them and they work fine, IP and name tally. Tracert them, and the IP leads to another machine. doesnt seem to affect the computers, they all keep there machine name etc, and see the network with no issues.
I was wondering whether this is a product of joining the two switches together, and not setting them up properly in managed mode.
All the IPS are generated via DHCP/DNS from the server.
Anyway. ITs a long shot, but maybe someone here knows how to get this issue sorted!
Cheers
Tim
Im a complete noob when it comes to networks, and I have the infortunate task of looking after my company one.
We have two power connect 2716's connected together in unmanaged mode, via port 16. Into these goes a SBS2003 server, 8 workstations, 6 PE 1950 and a few other things like laptops etc. Up till now I have no issues. But recently we have changed some of our software. One thing in particular uses licenses that need to be checked in and out. (being an animation company we have lots of licenses for everything, theres alot to manage)
This particular bit of software uses IP's and computer names to track who's checked a license out, etc.
This is where the error creeps in, several machines on the network are getting mangled IP's. ping them and they work fine, IP and name tally. Tracert them, and the IP leads to another machine. doesnt seem to affect the computers, they all keep there machine name etc, and see the network with no issues.
I was wondering whether this is a product of joining the two switches together, and not setting them up properly in managed mode.
All the IPS are generated via DHCP/DNS from the server.
Anyway. ITs a long shot, but maybe someone here knows how to get this issue sorted!
Cheers
Tim
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sentinel-master
345 Posts
0
March 14th, 2008 23:00
I think what your describing is due to the fact that you have not "Dynamic DNS" running on your DNS server - let me theorise....
Normally on A DNS server you have Host records which map to a paricular IP address and "never" change.
I guessing - but I think you have created DNS records for IP addresses of client PC's.....assuming they will never change or swap around. Unfortunately that's an invalid assumption - as with DHCP the IP address an end station can change or vary - depending on the LEASE-time and refesh of that lease.
So what to do.....
(1) On your DHCP Server - Reserve-leases for certain MAC address - so each PC (MAC address) always get offered the same IP address
OR
(2) Use Dynamic DNS - if your DNS server supports this - so that when a client PC gets a different DHCP offer -IP address - the DNS server is autmatically updated to reflect the new IP --> DNS name mapping
Thats my theory of your environemnt issue- if you "ping dns_pc_A" and actually end up pinging a different PC than the one you expected - thats what I believe is happening.
Woody79
6 Posts
0
March 20th, 2008 08:00
Thank for your help. I have now cleaned up my DNS logs, removing duplicate IP addresses, rebooted the server and the switches. Plus made sure that the forward and reverse lookup IP's are correct. I think that was causing the issue, due to multiple entries for same computer names. Never really had a cause to look into this, so its new territory for me.
I then reserved the IP's using the MAC addresses of all machines.
So far so good! thanks for your help!