I have a small office with a simple network infrastructure consist of:
1. Switch as a LAN for the inside users.
2. CISCO firewall ASA 5510 after the switch before the internet.
3. Leased line as an internet line provided on modem but with ethernet interface, connected on outside switch with the outside interface of the firewall.
Every thing is working properly.
But, i bought another Leased line as an internet line provided on modem with ethernet interface also, and i want to connect it also at the same time for the above setup sothat both internet lines will be back up to each other.
Ok, no problem, i can buy a new router according to your recommendation of which type.
But, if you please, can you tell me what exactlly the solution after adding router after the firewall to terminate the two internet lines at the same time, also tahe care that i have three published servers and i want them to be up on the two lines at the same time.
if you are going to a a router at the edge of the Internet you will be able to loadblance or to use redundancy over the two Internet links/ISPs
with the router as i mentioned above you can employ IPSLA IOS feature to monitor the link status by using for example icmp to the ISP next hope IP
of the IP become unreachable then the rouer will use the other ISP (backup) even if the modem LAN link to the router is up
this is one example
and you can you more complicated criteria
bellow is an example how to use IPSLA/PBR and NAT with an edge router using two differnt ISPs
keep in mind you not necessary use PBR or the same nat setup but this will give an idea about the features together
for accessing servers located behind the firewall this is a bit tricky because currently i will assume you have public IPs for these servers and you do NAT in the firewall to provide access to them from the Internet
these IPs provided to you lets say by ISP A
if you area going to have new link from ISP B they will give differnt public IP range
in this case you need to have a manual change when the main link is down
or you may consider to have DNS with an ISPand use te public IPs to map to your servers and i think this one a bit complicated
anyway have a look at the link and if you have any other question about the config just ask it here
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