Router DHCP not working with switch

dhcprouterswitch

I just hooked up a Dell PowerConnect 2824 in 'unmanaged mode' into our network and our router, a DLink DI-524, will no longer apply IP addresses via the DHCP to anything connected to the switch. In fact nothing connected to the switch even shows in the routers tables.

I am wondering if the router simply doesn't have the functionality to be able to work through the switch or if there is something wrong with the switch.

If you feel it is the router I was looking at something like the Cisco RV042 as I need remote VPN control although I would prefer a 10/100/1000 setup. so if anyone has any comments about that router or if there is something of better value please let me know.

My setup is as follows:
Modem -> Router -> Switch ->

Best Answer

Propably switch is not relaying dhcp requests to the router. To verify it, if you have physical access to these devices, you could plug a laptop instead of the switch , and see what happens.

If the laptop take an IP, it's switch's problem. In that case, you should just fix it to relay the requests.

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Cisco – Setting up a Cisco router for dial in access

The laziest way is almost certainly just to go:

async-1#terminal monitor
async-1#debug confmodem
Modem Configuration Database debugging is on
async-1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
async-1(config)#line 1
async-1(config-line)#modem autoconfigure discovery
async-1(config-line)#

The real answer is set &S0=1 in your modemcap (well probably) Actually you probably want to look at the whole list of vendor init strings http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a008009428b.shtml#specinitialcomm (that page also has some info on creating a chatscript and altering modemcaps)

Linux Router Problem

In your second topology, you appear to have a split subnet. 192.168.8.0/24 spans multiple switches which you state are layer 3. In your output from switch2, you have a static route for this /24 pointing at a single interface:

S      192.168.8.0/24 [1/0] via 10.58.3.254,   vlan 3

This means that traffic hitting switch2 destined for either 192.168.8.254 or 192.168.8.11 will be forwarded to the same next hop. At least one of those destinations

In order for this to work as you intend, you have a couple of options:

Configure switch[123] as layer 2 switches, such that the 192.168.8.0/24 is again a single broadcast domain.
Configure separate networks on each of the links: {device1 -> switch1, switch1 -> switch2, etc}

Best Answer

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Linux Router Problem

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