Network problem at work help!!

Hey guys,

Not sure where this is suppose to go but hopefully it's the correct place to ask.

We are having issues at work with the network. We have multiple sites across the Province and some users cannot access the internet at all but others can at the same location. This is happening to about 4-5 different sites with some being 300+KM apart. A user here was able to access the internet in the morning fine but after a restart of her computer she could not access the internet anymore. I'm very confused since it's not the entire sites that are down.

Does anyone have any idea's what it could be?

Thank you

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Comments

networker050184

First guess would be something up with DHCP addresses given out. The computer restarting and not being able to get back on after could be a key indicator.

d4nz1g

Hi mate,

Do you have any proxy servers? If yes, are the users reaching this server?

Also, you might have to check for any firewall rules for the user's network. See if the netmasks on any rule match the user networks.

Those are just guesses of what to look at first, with the amount of detail you provided it is not possible to accurately know what is going on.

Keep in mind that "accessing internet" is not the right way to identify what is wrong. You need to check layer 2, 3 and 4 connectivity; dns lookups, and so on.

TechnicalJay

Thanks for the reply guys, I'll do some more troubleshooting and report back

pinkiaiii

guess that what makes networking interesting,founding solution when troubles occur.

given that its happening accross wide area thus most likely not layer 1 issue,thus see what ipconfig shows,and follow up with pings traceroute to see where its breaking off,could be dhcp pool issue or some router on the way out.

sschwieterman

networker050184 wrote: »

First guess would be something up with DHCP addresses given out. The computer restarting and not being able to get back on after could be a key indicator.

Yep, sounds like it could be a duplicate IP issue. Especially if some are having the issue and other are not.

Is it all in the same VLAN/different VLANs? The key will be finding out what the consistency is with the issue.

What changes have recently been made to the network? New hardware, VMs, etc?

TechnicalJay

We have 2 DNS servers for work and after a restarting them, it seems like it has fixed the issue!

NetworkNewb

hopefully figured which one of the two was causing the issue