Establishing a VLAN but DHCP requests are going to wrong DHCP server

Hello EE!

Based on my previous posting, I've made a little progress establishing a VLAN.  The problem is that now any client on my domain is looking to the cable modem for DHCP information.  We have a DHCP server that provides IP addressing information to clients on our domain.  But, once I plug in the cable modem's connection into Port D1 on our main switch, all the domain clients look to the cable modem for DHCP information.

Here's what I've done to establish the VLAN:

1 - On the HP ProCurve 4208v1 switch, I created a VLAN called "TimeAndPay" with an ID of 2
2 - I assigned 4 ports (D1 - D4) to this VLAN and Tagged all four ports as being part of the new VLAN
3 - On the other managed switch (HP 2524) I created a VLAN  called "TimeAndPay" with an ID of 2
4 - I assigned port 20 to this VLAN and Tagged that port as being part of the new VLAN
5 - I assigned a static IP address of to the clock and plugged the clock into port 20 of the HP 2524
6 - I was able to ping
7 - Thinking it was successful, I suddenly lost internet access on my desktop that resides in our primary domain
8 - When I went to renew my IP address, the DHCP information came from the cable modem and not the domain DHCP server
9 - I unplugged the connection between the Linksys SR2024 unmanaged switch and clients resumed obtaining DHCP information from our domain DHCP server

My questions are as follows:

1 - Did I create the VLAN correctly?
2 - How can I ensure that DHCP information is being provided by our domain DHCP server once I reconnect the clock to the VLAN?
3 - Is there anything else I need to check on to ensure this works smoothly?

Thanks for all your help and I've attached a diagram of what I have in place with respect to the VLAN.


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there seems that nothing wrong is went with your VLAN configurations, the problem is that as far as i notice from your diagram that you dont have router to route the traffic between your different networks and vlans and your client will always get ip addresses from the DHCP enabeled device that is physically closer to them  as long as there exists no route between your networks so this being said there will be no solution to your client from getting ip addresses from your modem unless you reserve ip addresses for your clients in the DHCP you wish to get addresses from or disable the DHCP of your modem.

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BHTNAuthor Commented:
Hello elawad,

Thanks for the reply.  You mean that a client can tell how physically close a DHCP server is?  I can honestly say I've never heard that before, but there's always something new to learn.  I will turn off DHCP and see what happens.  Be back shortly!

It doesn't know, but it just depends on which server responds quicker.  Usually, the closer one does.
BHTNAuthor Commented:
Ok, I put the clocks on static IPs and disabled DHCP.  It worked!  Now that I've tested this one clock via VLAN I can move forward and configure the other three.  Thanks everyone for your help!

BHTNAuthor Commented:
Solved my problem!
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