Magnet LLU DSL With a Mikrotik; Odd DHCP problem

valen · 17-12-2015 09:47AM #1

I'm having an odd problem; the plan was to setup my Magnet TG703 box in bridge mode (thanks to an old post from Nick Hilliard!), then have it give my Mikrotik CRS125 a DHCP address, and have the CRS125 do NAT etc.

Bridge mode works fine, anything I plug into it gets a DHCP address.... except the CRS125. Which is really odd. When I run the Mikrotik 'torch' app on the interface, I see DHCP requests going out, but never answered.

Anyone ever see that ? Is there something...curious about the DHCP servers Magnet use ?

ED E · 17-12-2015 11:25AM

Not sure why it'd be different but try passing PPPoE through to the crs?

valen · 17-12-2015 04:23PM

Someone else suggested that - how do you get PPPoE login details ? I dumped the config from the TG703 in bridge mode, but didn't see any mention of the DSL username & password that magnet mentioned on https://www.magnet.ie/business/faq/how-do-i-re-configure-my-zyxel-modem/

thefinalstage · 17-12-2015 05:13PM

valen wrote: »

I'm having an odd problem; the plan was to setup my Magnet TG703 box in bridge mode (thanks to an old post from Nick Hilliard!), then have it give my Mikrotik CRS125 a DHCP address, and have the CRS125 do NAT etc.

Bridge mode works fine, anything I plug into it gets a DHCP address.... except the CRS125. Which is really odd. When I run the Mikrotik 'torch' app on the interface, I see DHCP requests going out, but never answered.

Anyone ever see that ? Is there something...curious about the DHCP servers Magnet use ?

Are you a residential or business customer? Cause for bridge mode to work properly on their LLU you will need a static ip and to assign that to your device.

17-12-2015 11:43PM

Magnet don't use PPPoE on LLU; rather they use routed bridge encapsulation (RFC1483). May also be listed on a router as "1483 bridged IP LLC" or "ENET ENCAP".

valen · 18-12-2015 10:24AM

Any idea why bridge mode doesn't work with LLU ? Other devices (OSX laptops, android phones) seem to have no problem getting an IP over the bridge. It's just the Mikrotik box that seemed to have a problem.

Cuddlesworth · 18-12-2015 01:46PM

valen wrote: »

Any idea why bridge mode doesn't work with LLU ? Other devices (OSX laptops, android phones) seem to have no problem getting an IP over the bridge. It's just the Mikrotik box that seemed to have a problem.

Magnet to Mikrotik is a different set of circumstances then the Mikrotik device serving DHCP to internal devices.

valen · 18-12-2015 03:20PM

Well, yes. The Mikrotik's DHCP server is giving my machines internal IPs, that's fine. Completely separate, understood and working.

But the Mikrotik's dhcp-client is being ignored by Magnet. Anything else plugged into the uplink from the mikrotik to Magnet gets an IP. Which is ... odd.

18-12-2015 04:07PM

Is there an option on the Mikrotik WAN side for 1483 bridged mode?

valen · 18-12-2015 04:58PM

Nah, the Mikrotik doesn't have a DSL port.

flamegrill · 19-12-2015 10:24AM

LFE in effect Valen?

Magnet LLU DSL With a Mikrotik; Odd DHCP problem

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