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2 ISP with 1 CMTS

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javierg
2 ISP with 1 CMTS

Hello everyone.

I have a customer that is currently working with just 1 ISP for his network, but because the grow he needs to add a secondary ISP (because the current does not support more bw) and put them work together. The main problem is that this network uses public (valid) IPs, so I have several questions about how to do it. Other note is that this network is not an AS network, in fact, the public segments are published on the ISP.

1. Can I publish the same IP segments with different providers?
2. Should I use BGP even if this network is not an autonomous system?
3. Can I do something using just RIP to load balance the traffic between the providers?

Im sure there are a lot of things that may be Im not considering, so please go ahead with any question do you have.

Thanks.

Killa200
1. Absolutely! You will need

1. Absolutely! You will need to get your own ASN and commit to bgp between the two links. They may or may not allow you to use their IP space between other providers, so plan on getting your own through the IP provider in your country, which will be the same place you get your ASN from.

2. If you want to use the same addresses on both providers, you will be required to use BGP, and become an autonomous system.

3. I wouldn't suggest load balancing in this scenario, as your going to do a lot of session breaking for you users as pages requiring authentication swap between providers and ip addresses. Not to mention you would need to do some sort of NAT for dynamic load balancing, or pooling of users between upstream providers to do static load balancing.

javierg
Thanks Killa200

Hello Killa200...

Yes, I was trying to figure out how to do it and yes, I need an ASN.
Meanwhile we get the ASN, Im thinking on use NAT with private IPs and do some load balancing.

Thank you very much for your time.

kwesibrunee
Beware if you do two ISPs

Beware if you do two ISPs that most providers won't pass anything over bgp smaller than a /21 and the inbound load balancing will be nearly impossible, only load sharing, i.e. one subnet across one ISP the other subnet across the other, with failover in case a link goes down. There is a definite distinction between the two.

Your fight with two ISPs will be to balance your customers bandwidth wise between the two ISPs, it does work but is considerably more difficult than with one ISP.

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