ADSL Bonding

smellyalater

Does anyone know if any ISPs in Ireland are doing ADSL Bonding?

Tomtata

Magnet do it for their 4mb SHDSL product -> 2x 2mb bonded.

http://www.magnetbusiness.ie/products/bus_broadband_prem.htm

msg11

ASDL Bonding/Bonded ? What the hell is this ! Never heard of this before ..

Had a quick read on wikipedia, is this something similar to link aggregation ? Looks very expensive?

Could you not get to ASDL subscriptions and use a switch too attempt load balancing ?

Joseph9090

Bonded ADSL is where two or more ADSL lines are joined together, usually at layer 2, so that they look like a single line. They would have a single IP address shared between them. You can lose a link and the applications won't notice it happened - VoIP calls will keep on going.

It is much simpler than using load balancing, which can be quite complex when address translation is in use. When load balancing using NAT, a single PC on the LAN will usually use one line at a time. When bonding a single PC will very effectively use both lines at the same time.

For an overview see:

http://www.virtualaccess.com/uploads/files/Introduction_Bonded_ADSL.pdf

You are quite right in that it typically isn't dirt cheap. That said, two bonded business ADSL lines are usually simply twice the price of a single business ADSL line, but it depends on the service provider. It is usually used by businesses in applications such as SIP trunking and cloud computing where very high availability access is a must.

msg11

Looks the part, it's always a pitty about the price with these types of services.

This isnt covered in the CCNA I don't think. Two questions!

Which course is it covered in?
And is it routing or wan service ?

Dardania

It would be a wan service I'd guess...

Do any providers do it over diverse connectivity options eg DSL & FWA?

Joseph9090

No, I have never heard of anyone is doing bonding over a mixture of ADSL and wireless.

If you want very high availability then to have an ISP who takes ADSL access from two wholesale access providers would be good. For example, one ADSL line could be terminated on an Eircom DSLAM and another on one of the LLU providers DSLAM (Digiweb/Smart, BT etc.). In this case if one of the DSLAMs goes down the service keeps on going.

smellyalater

Its probably covered in CCNP. Its done using MLPPP. Its very popular in the UK. The Irish ISPs don't seem to offer it, well not in any obvious manner. I'm sure they'll catch up eventually.

Dardania

There musn't be enough CCNPs to tell them how to do it ;-)