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New Contributor II

Netvanta 3430 DHCP Relay

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i just bought a netvanta 3430 Gen 2 with the understanding it does DHCP Relay

when i type the command IP DHCP RELAY ?

i get

% Unrecognized command

this page says it does it: https://www.adtran.com/web/page/portal/Adtran/product/1202820G1/118

what am i doing wrong?

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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The relay command is done at the interface programming level.

Try going into global config first:

type: configure terminal <Enter>

AIP 3430 Router(config)#

Then, select the interface that you want to relay the DHCP requests from (i.e. Eth 0/1, Eth 0/2).

Example for relaying requests broadcasted on eth 0/1:

AIP 3430 Router(config)# interface eth 0/1 <enter>

AIP 3430 Router(config-intf-eth 0/1)#

then type IP DHCP RELAY DESTINATION 192.168.0.199 <enter>

this will relay any dhcp requests seen on interface eth 0/1 to 192.168.0.199.

You can put this in each interface that will rely on a remote dhcp server.

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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there are a couple of ways to achieve DHCP relay in the NetVanta 3400 series routers.

With the newer versions of firmware, it is easy to do  You won't find a means of doing it with the web GUI. Use the CLI.

Example of interface configured to relay dhcp requests to a dhcp server:

interface ethernet 0/2

description LAN

ip address 192.168.1.1 255.255.255.0

ip dhcp relay destination <address of remote DHCP server>

no shutdown

Keep in mind that if a firewall is running, you may need to configure the firewall to allow the relaying of those dhcp packets (UDP 67,68).

R\

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New Contributor II

Re: Netvanta 3430 DHCP Relay

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i'm running R10.0.0.E latest firmware

as i said in the post

aip 3430 router#ip dhcp relay 192.168.0.199

% Unrecognized command

when i query for possible command with the "?"

AIP 3430 Router(config)#ip dhcp ?

database - Configure a DHCP database agent

excluded-address - Configure DHCP address exclusions

ping - Configure DHCP ping parameters

pool - Configure a DHCP server address pool

AIP 3430 Router(config)#

relay isn't there

On Wed, Sep 11, 2013 at 12:23 PM, vmaxdawg05 <

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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The relay command is done at the interface programming level.

Try going into global config first:

type: configure terminal <Enter>

AIP 3430 Router(config)#

Then, select the interface that you want to relay the DHCP requests from (i.e. Eth 0/1, Eth 0/2).

Example for relaying requests broadcasted on eth 0/1:

AIP 3430 Router(config)# interface eth 0/1 <enter>

AIP 3430 Router(config-intf-eth 0/1)#

then type IP DHCP RELAY DESTINATION 192.168.0.199 <enter>

this will relay any dhcp requests seen on interface eth 0/1 to 192.168.0.199.

You can put this in each interface that will rely on a remote dhcp server.

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New Contributor II

Re: Netvanta 3430 DHCP Relay

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that did it!

thank you

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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Great. Please mark the question as “Answered”.

Thanks

R\

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New Contributor II

Re: Netvanta 3430 DHCP Relay

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I have a somewhat related question.  I have a router with two DHCP pools; one for voice and one for data.  I want to keep the DHCP pool for voice but use a relay agent to forward DHCP request to another location.  When I type the following commands:

ip forward-protocol udp domain

ip forward-protocol udp bootps

I get an error saying I can't enter these commands because there is an internal DHCP server running already.  So does that mean that it is impossible to have an internal DHCP server for on VLAN and relay DHCP request for another VLAN at the same time?  (I'm using a 3448 by the way)

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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This is what I find easiest.

On the interface that you want relay DHCP, issue the following (using VLAN 1 for demo purposes):

Interface VLAN 1

ip address X.X.X.X 255.255.255.0

No shutdown

ip dhcp relay destination

This is a feature that was added a year ago or so that makes life so much easier.

Hope this helps.

R\

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New Contributor II

Re: Netvanta 3430 DHCP Relay

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Oh, ok.  So you are saying that this should be allowed even though a DHCP pool exists on the router already?  I will try that out and see if it works.

Thanks!

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Contributor III
Contributor III

Re: Netvanta 3430 DHCP Relay

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Yes,

When the router has one or more DHCP pools, it listens on all interfaces for DHCP requests. If an interface’s network is not one of the scopes, it will not be able to assign an address to any hosts on that network. The “ip dhcp relay destination” statement in the interface causes the router to forward those requests to the address specified rather than check it’s own pools for processing the DHCP request.

This way you can provide DHCP for some interfaces, but relay for others.

R\

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