intermittent internet disconection

hi all,
I have a situation here.
my clients keep getting disconnected from internet almost everyday.  Not all clients but only happens to the last person who comes into the office and turns on and logs onto a workstation.
this is how the network is wired:  from the router to a netgear switch  (has poe and non poe ports) to the ip phone and to the workstations.  any idea?
mwaukiSystems EngineerAsked:
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Leroy LuffHead of IT & DIgitalCommented:
My guess is its the capacity of either the router or switch.

1st - Swap the router with a test unit and test <<< This will most likely solve your issue.

Afterwards do the same with the switch.

mwaukiSystems EngineerAuthor Commented:
the router is cisco 877 and switch is 24port netgear.
when he gets disconnected do you mean a physical disconnect shows (red X on windows) or no communication?
do you have enough ip address on your DHCP server? also check lease time for ip address allocation..

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Tony GiangrecoCommented:
I'd bring in a 24 port Gig switch and move 1/2 of the connections to it and plug it into your router also. I'll bet that resolves the issue. your probably overloading the old switch or the switch ports may be going bad. make sure the router and switch are plugged into a UPS-Battery Backup that has proper wattage specs to match the load you put on it.

If it's a managed switch, you can login and look at the ports to see what's been happening.
mwaukiSystems EngineerAuthor Commented:
It is a managed switch which the voip ventor controlls and i do not have access.  When i bypass the phone, the workstation cant even get an ip.  You think having separate switch, one for the phones and one for the workstation, would easily resolved? By the way, i have expanded the dhcp scope to 45 available ips and not counting the phones, workstations and network printers are all equals to 20 devices which means there are still lotsa ips available.?
Tony GiangrecoCommented:
If you have a viop system with phones on their pwn network cables, if move all phones to a seperate managed switch. If they are on the same switch, activate the option that provides priority for the viop phones in the switch already in place.

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Tony GiangrecoCommented:
QOS (Quality of service) option should be turned on for all voip phones. This sets the switch or router to provide priority to all Voip traffic in the network, Make sure that is on.
mwaukiSystems EngineerAuthor Commented:
Thank you guys!  as per voip vendor that has access to the managed switch, QOS is already turned on.  I think I am recommending that voip system with phone be moved to a separate switch and workstations to its own switch.
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