Two gateways no routing protocols

[Cheeseontoast]

Hi There.

Could you help with this situation?

I have a router that is connected to a LAN which has two gateways to the external world. No routing protocols are exchanged with the gateways. I wish to build a tunnel (GRE no IPSec) to a common endpoint on the outside world. I want to use the redundancy of the dual gateways but cannot figure out how to declair the gateways for the remote endpoint IP address. Problems are:

1. If i use a static it will not disappear when that route is down.
2. Floating statics are no good because we are not using dynamic RP.

Its almost like we need two static routes, where one is dependent on the other being up.

Would it be possible to set up a second tunnel as a backup interface tied to a watch statement on routes from the first tunnel?

Who Knows. How you can help.

 

[NettableWalker]

Have you tried HSRP?

not too sure how to set it up, but i think that it's what your looking for.

http://www.cisco.com/warp/public/619/3.pdf

 

[tech1994]

Sounds like HSRP may be what you are looking for.

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[voltron1011]

You don't want to load ballance between the two links, you just want a backup router and link?

 

[leedsit]

Hi,

Are you two internet routers internal interfaces on the same Subnet??? If so HSRP is your option....

Two groups of HSRP running, one router is the master for the first address, the second router is the master for the second IP address. You can on each router track the serial interface, so if this failes, HSRP on the will still switch over internally. With this option you can have your internal router using two equal cost path static routes to the HSRP master addresses. With CEF enabled this will load balance per packet.

However if your two internet routers do not have the internal interface on the same subnet..... you have to do this with a routing protocol such as OSPF.

Lee

LEEroy
MCNE6,CCNA2,CWNA, Project+

 

[Cheeseontoast]

Hi Guys

Thanks for your responses but i dont think that HSRP is an option since the gateway routers belong to a third part device (arhh and its not cisco) and as such will not support (or implement) HSRP or VRRP.

If you think of them as just plain old IP interfaces with no fancy bits on it may help.

Thanks in advance for your time and effort.

 

[KiscoKid]

VRRP is Cisco independent. Does your non-Cisco box support this? Failing that, you should look at deploying OSPF or something similar between your gateways

 

[leedsit]

VRRP is IEEE and as Kiscokid mentioned, most other devices support this.

Well, two static routes would work, however if the interface on the other side of the connection died, then you would route into a black hole. If the internet router died or the internet routers ethernet interface went down that is on the local subnet to your router then your static route should drop out the routing table as the next hop is not reachable and you would route via the other router ( providing you did have two static routes ) but I dont think you will get full resilience with the restrictions you have.

LEEroy
MCNE6,CCNA2,CWNA, Project+