Networks

Ask something
Discussion Locked

Switching between redundant DSL/T1 lines

0 helpful
5 replies

by cmoses72

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

I need to implement a redundant high speed line for my network. I am not to sure on how to actually do this. I know I need to lines, a router/switch, firewall. How do you configure your router/switch to point to another IP address once the initial line goes down?

Thanks

5 replies

by maniskid

Putting multiple forwarders into a DNS server. Such as connecting the routers to the DNS server and then setting forwarders to the supplied address(es) <- it may be the same

Setting the metric information so that the preferred line is used.

It is perfectly reasonable (ie its expected) to duplicate DNS, DHCP, RADIUS, ISA services across a network to avoid a single point of failure. Active directory has the capability to share the volume across servers so you often just need to duplicate this information.

For performance use both or the cheapest, and set up things such as stub servers.

Note, the best way to provide remote microsoft networking is through ISA/RADIUS which is a good way to go.

by cg it

use a Cisco Access router. They are pricy but they have the capability to utilize both lines [WIC-ADSL modules] on a aggregate basis [2 port WAN] and also as redundancy [2 port WAN unresolved gateway fowarder e.g. 0.0.0.0 route]plus use ISDN as a fail safe. Symantec has something similar as does 3Comm. ISA Server 2004 only [not 2000]can do it as well but its aggregate bandwidth more than failover.

by otl

I like your idea, quick question; "How do the lines get into your building ?" Riding the same cable does creates a single point of failure !

Single biggest problem I have found is the last mile to the customer premise ! Along with someone hitting the wrong power switch at the end of the day ! Best redundancy I have found is have one on copper and one on fiber to the building, cuts your chances of both being cut at the same time !

This discussion is closed to new replies.