Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

ERS 3500 - no dhcp to clients

ERS 3500 - no dhcp to clients

ERS 3500 - no dhcp to clients

Hi guys,

I am having problems doing some of the basic tasks in networking, and I don't know if my ERS3510 (Ethernet Routing Switch 3510GT HW:02 FW: SW:v5.3.3.014 BN:14 (c) Avaya Networks) is broken or I am doing something wrong here..

So here's the deal.

I want to program ERS to have on Port 1 - direct internet link (so direct ip from provider), and the other ports I want to have a local network (like seting un a basic tplink router). So for this I know I have to create 2 Vlans... 1 for port 1 and 2nd for the other ports. I enable ip routing, I set up vlan ips for each vlan and I enable dhcp server for the 2nd vlan. now here is where i'm stuck, i don't get IPs from dhcp for the second vlan..
But when I create dhcp pool for the management vlan then I get IP from dhcp server.. .

I am not an expert in networking but ther's something fishy here.. Anyway, if you can help, please tell me what info do you need from me to figure out what's wrong :)

Thank you,
All the best!

PS: I hope I am posting this in the right place bigsmile

RE: ERS 3500 - no dhcp to clients

Can you post The vlan, ip, and dhcp config and a "show ip dhcp-server pool"

RE: ERS 3500 - no dhcp to clients


Sorry for the delayed response. I don't have my hands all the time on this ERS :)

So I have managed, somehow to make the dhcp pool work.. i did the same steps as i did before so that's strange..

Anyway, now I am stuck at another problem.

So I have Vlan 1 - management vlan. Vlan 20 - port 8 - dhcp pool>120 with IP and Vlan 40 that i have created for the link with the public internet from the provider. I have set up IP and created a static route Problem is I don't have internet for dhcp clients.. is there something else I need to do? this looks like a routing problem :-? because from i can ping into but not to .49
The gateway is an equipment in our rack and not at the ISP..

I have attached a putty session with ERS3510 . I have printed "show tech" so I think you will have there all the info.

RE: ERS 3500 - no dhcp to clients

The public IPs don't know the route into your internal network. You need a NAT device in between!

You should never ever link your internal network directly to the internet besides you want to be hacked in less than one hour!

RE: ERS 3500 - no dhcp to clients

Your router with address needs to NAT the public IP to a private address.
You need something like below. Private addresses cannot be on the public internet because internet routers will not route private addresses.

Router (NAT)
Public: (to ISP router)
Private: (to switch vlan40)

Switch (vlan40)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close