ammounpierre
asked on
Internet from 2 ISP ?
Hello Gurus,
I have a physical server that has on it 2 NIC an 2 static IPs from 2 different ISPs.
suppose ISP1_IP and ISP2_IP
On that server I installed mdaemon server and it has an internet connectivity.
I also configured my Juniper Firewall to have a fail_safe internet on the Server and a load balancing too.
So normally if ISP1 goes down, I still have internet connectivity on the server using ISP2 ...
and vice versa.
I asked ISP1 to resolve http://ISP1_IP to http://mail.mycompany.com and using my Juniper I use port forwarding to get to port 3000 (WorldClient of mDaemon).
Now my problem is that if ISP1 goes down, and even though I still have internet on the server using ISP2 ...
I can not log in to Worldclient using http://mail.mycompany.com since it is resolving to ISP1_IP.
I can of course use something else like http://ISP2_IP:3000 to access my WorldClient ( and I tried it and it works).
But what I need is a kind of "routing" between ISP1_IP and ISP2_IP automatically.
or else the user will have always to try ...and if it doesn't work ..then he has to try the second one...
Then I came across something called BGP and it seems that this is what it does !
Can someone please explain to me the mechanism and how I should do it ?
or it is my ISP thing to do ? I called but they both said that this is not feasible !!!!
Thanks Gurus !
I have a physical server that has on it 2 NIC an 2 static IPs from 2 different ISPs.
suppose ISP1_IP and ISP2_IP
On that server I installed mdaemon server and it has an internet connectivity.
I also configured my Juniper Firewall to have a fail_safe internet on the Server and a load balancing too.
So normally if ISP1 goes down, I still have internet connectivity on the server using ISP2 ...
and vice versa.
I asked ISP1 to resolve http://ISP1_IP to http://mail.mycompany.com and using my Juniper I use port forwarding to get to port 3000 (WorldClient of mDaemon).
Now my problem is that if ISP1 goes down, and even though I still have internet on the server using ISP2 ...
I can not log in to Worldclient using http://mail.mycompany.com since it is resolving to ISP1_IP.
I can of course use something else like http://ISP2_IP:3000 to access my WorldClient ( and I tried it and it works).
But what I need is a kind of "routing" between ISP1_IP and ISP2_IP automatically.
or else the user will have always to try ...and if it doesn't work ..then he has to try the second one...
Then I came across something called BGP and it seems that this is what it does !
Can someone please explain to me the mechanism and how I should do it ?
or it is my ISP thing to do ? I called but they both said that this is not feasible !!!!
Thanks Gurus !
Last Comment
ASKER
If the cost is the issue, I do not mind paying in order to get this.
I was under the impression that you could purchase a virtual IP so that this virtual IP is in fact pointing to one of the 2 ISP_IPs.
I was under the impression that you could purchase a virtual IP so that this virtual IP is in fact pointing to one of the 2 ISP_IPs.
It's not a matter of paying a small fee. It becomes a semi-permanent change to both ISPs networks that must be documented and maintained. It requires that you're assigned an AS, then create agreements among your and your ISPs. Then create routes on a router capable of storing a good chunk (if not all) of the Internet's address prefixes. Your ASN must be approves and registered by IANA.
AFAIK, VIPA is used inside of private networks, and is not like BGP. It's a virtual address for which the core router always answers as being available, then routes to the host claiming to be active.
AFAIK, VIPA is used inside of private networks, and is not like BGP. It's a virtual address for which the core router always answers as being available, then routes to the host claiming to be active.
It's not a matter of paying a small fee. It becomes a semi-permanent change to both ISPs networks that must be documented and maintained. It requires that you're assigned an AS, then create agreements among your and your ISPs. Then create routes on a router capable of storing a good chunk (if not all) of the Internet's address prefixes. Your ASN must be approves and registered by IANA.
AFAIK, VIPA is used inside of private networks, and is not like BGP. It's a virtual address for which the core router always answers as being available, then routes to the host claiming to be active.
AFAIK, VIPA is used inside of private networks, and is not like BGP. It's a virtual address for which the core router always answers as being available, then routes to the host claiming to be active.
ASKER
And how do I proceed to get this done ?
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ASKER
There appears to be an alternative way of doing multi homing with cisco without BGP using NAT, here is the article:
http://www.networkworld.com/community/node/29914
comments ?
http://www.networkworld.com/community/node/29914
comments ?
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If you have equivalent bandwidth on both WAN1 and WAN2, then you might consider DNS round-robin. Not elegant, but it would alternate IP addresses whenever somebody hit that host name.
Otherwise, make mail1.company.tld point to WAN1, & make mail2.company.tld point to WAN2 and tell users to use 'mail2' if 'mail1' is not working.