LAN with two ADSL connections

[jpadie]

As a follow on from my previous question, I am looking for help on the following question:

can I create a PPPoE session across a wired LAN? i.e. where there is not a 1-1 connection from PPPoE client to ADSL Modem?

example:

imagine a wired lan with multiple PC clients in the 192.168.1/24 subnet
this wired lan currently has an adsl router providing internet connectivity. Via telephone line 1.
add a second telephone line. i am looking to create a pppoe connection across an adsl modem attached to the lan.

if so, how does this work? does the pppoe client just sniff out the right phone line to get down? or is it a broadcast type thing? I assume that i put the adsl modem/router in bridge mode and then that the pppoe client will pick up the public IP address?

the net effect I am wanting to create is a vlan created on the LAN where the vlan uses a specified router and has the dynamically allocated public IP.

there is no funky equipment on the lan to create the vlan separation.

 

[HungryHouse]

If I understand your question correctly, merely adding a second DSL connection is NOT the way to go here.
There is one subnet, and hence one default gateway for the clients. The PPPoE is frankly inconsquential.
The ADSL router most likely has the ADSL modem built into it.
It is doing NAT for Internet connectivity for your 192.168.1.x clients.

If you wish to create a VLAN, or any sort of network separation, then those clients would need to be on a separate subnet, or if nothing else a separate Layer2 VLAN - and nothing funky is needed for this. Any old managed switch has this capability. You can even use something like an old Nortel 350 or 450, or an old 3Com switch which you can pick up preowned as inexpensively as you can a SOHO router or switch.
if you can pick up one of those, then no need for paying for yet another ADSL line, and you can keep your traffic separate, as long as your router can support 802.1q. If not, then get a 3 port router to make this happen, and don't even bother with tagging at all. (2 LAN, 1 WAN).
Use the standard ADSL modem that provider gives and you'l be all set.
I don't recommend getting a second ADSL line for your purposes.
Thanks, HH

 

[jpadie]

Thanks. The secon line is a requirement for many reasons. The simplest of which is contention. There are sixteen offices sharing the same bandwidth for voice and data and the speed is not adequate to maintain reliable connectivity.
The second is that I have no ability to influence the hardware setup of the business centre. Even if I bought them a layer 2 managed switch to do the vlan routing they most probably would not use it without the approval and cost of their hardware engineer vetting the whole thing and then installing and maintaining it. Currently they have a bunch of 24 port routers hooked up to latch panels and then directly connected the adsl box. That is a common solution here.
There are other reasons too but I have concluded there is no viable alternative to a second line and adsl box.
Likewise I took the view that the best course of action was simply to string some sftp cat5e through the ceiling panels one evening.

 

[HungryHouse]

In that case, go ahead and get the second ADSL line, but DO get another router for the second group of users, and be sure (for sanity sake) that the DHCP range is different on the second router. The PPPoE client is the router which is normal for any type of DSL network connection.

You may even be able to get the provider to buck up for the rtr as part of your monthly lease. This is fairly standard for a small business DSL line.

I hope this helps.

-HH

 

[jimbopalmer]

Dual WAN routers exist for this. I use the RV042, but you may wish to look at the RV082 or RV016 as your setup sounds larger.

I tried to remain child-like, all I acheived was childish.

 

[jpadie]

thanks all.

as said, I cannot influence the hardware choices of the business centre. and as the hardware is supplied by the ISP (and the VoIP is built into the hardware and is not SIP), we have to use that or lose functionality.

Whilst I have found a solution I am still interested in the answer to my original question.

 

[burtsbees]

PLease list your hardware and functionality.

Does the supplied router have dual WAN ports? Capable of PBR?

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[jpadie]

no.

the router + adsl modem is a standard consumer-type unit that has a completely locked down UI. you cannot even change the subnet for DHCP allocation.

the CPE provides adsl modem + 3 port LAN + 1 port TV + 1 port tel. this is the standard configuration for the french market.

the tel functionality is provided by MGCP and the parameters for the user's connection are recognised serverside by the MAC address. so i cannot substitute another, more flexible box, and retain the telephone functionality (or I could if I bought another MGCP box and spoofed the mac address - more trouble than necessary).

the french choose this method of home + business ADSL deployment (including fibre) in order to minimise support costs. and the concept of customer service simply does not exist in France, so the fact that one or many customers might want something different simply does not enter the company's consciousness. and it is not just my provider: they are all identical.