EIGRP trouble / Windows

[ArnoldVisser]

Hi I'm just starting some testing with a cisco and backup interface. After adding an ROUTER EIRGP 1 comand and adding de NETWORK 192.168.1.0.

My computer has a default gateway to this router.
The router has a default gateway to an different adsl router 192.168.1.10

When i ping to an ip addres that lies on the internet my computer "learns" an extra route

when i give a route print command (windows)
192.168.1.10 mask 255.255.255.255 to 192.168.1.10 is automaticaly added how do i prevent this????

 

[baddos]

That is correct. What that is saying, is that in order to get to HOST 192.168.1.10 goto 192.168.1.10. Because it's on the same segment, the next hop is the destination.

 

[ArnoldVisser]

Hereby some extra information.

When i ping to 194.134.0.10 then also a route is automaticaly added to my windows route table for
194.134.0.10 255.255.255.255 -> 192.168.1.10

but the cisco router has ip address 192.168.1.100

 

[baddos]

Is your computer setup for 192.168.1.100 as the default gateway?

 

[oj88]

There is an ICMP message called "ICMP Redirect". What happens is that, when a host (your PC) sends a packets to the default gateway (Cisco router), which in turn forwards the same packet to the next default gateway (aDSL router), and this 2nd gateway is on the same network as the host, the 2nd gateway (aDSL router) will send out an ICMP redirect message to the host informing it that a better route is available for that particular destination.

In other words, don't bother disabling it. Or you'll end up with a relatively slower network.

If you have a CCO account, you will be able to see Cisco's explanation (with illustration) for ICMP Redirects at

http://www.cisco.com/en/US/partner/tech/tk826/tk365/technologies_tech_note09186a0080094702.shtml

Orlando Palomar Jr
CCIE# 11206, CCNP
CIPT Operations Specialist
Phil-Data Business Systems, Inc.

 

[oj88]

Oh by the way, EIGRP has nothing to do with populating your PC's routing table. Orlando Palomar Jr
CCIE# 11206, CCNP
CIPT Operations Specialist
Phil-Data Business Systems, Inc.

 

[ArnoldVisser]

Does this redirect ICMP restore itself when a link is temporary unavailable? It seems that my pc's keeps this route!