07-18-2011 05:03 AM
Hi
I have problem with the following setup:
I am using DMVPN (GRE, IPSec and EIGRP) in my network, tunnel interfaces on both routers are in the same subnet 10.64.24.0/22. Tunnels are up and functional. On R2 I have static NAT configured:
ip nat inside source static 192.168.x.x 10.64.24.x
interface fas 0/0 (inside interface)
ip nat inside
interface tunnel 0
ip address 10.64.24.y 255.255.252.0
ip nat outside
192.168.x.x is inside local IP address of PC2 and 10.64.24.x is inside global
If there is a static route on R1 : ip route 10.64.24.x 255.255.255.255 10.64.24.y then I can ping PC2 from PC1.
If there is no static route on R1, ping fails.
PC1 and R1 are part of the central location, PC2 an R2 are part of the branch location. I have 50 branch locations.
I am not sure what is the problem and I hate to mix static routing and EIGRP. Is there any other solution?
Thanks
07-18-2011 03:25 PM
Đesi čova buraz, kaka je situacija ? Vidim imaš problema :-)!
Malo sam razmišljao na ovu temu i možda ću sada reći nešto glupo (zato pišem na Srpskom):
Pošto se radi o DMVPN-u odnosno o NBMA okruženju, ARP ne pije vode kao kod standardnog
NAT-a u broadcast multi access okruženju, gdje bi ti ruter odgovarao kao proxy na ARP zahtjev
za adresu koja je mapirana na njemu. Ali...šta je zamjena za ARP u NBMA okruženju ? Odgovor
je : NHRP!!! Po mom mišljenju, treba samo da dodaš još NHRP mapiranja za svaku NAT-ovanu adresu
na tunel interfejsu NHRP servera, npr ovako:
Ako imaš ovakva mapiranja na SPOKE strani :
ip nat inside source static 192.168.100.2 10.64.24.2
ip nat inside source static 192.168.100.3 10.64.24.3
ip nat inside source static 192.168.100.4 10.64.24.4
Onda na HUB-u koji je NHRP server treba da dodaš ova NHRP staička mapiranja:
interface Tunnel0
ip nhrp map 10.64.24.2 10.201.x.x
ip nhrp map 10.64.24.3 10.201.x.x
ip nhrp map 10.64.24.4 10.201.x.x
...
Gdje je 10.201.x.x fizička adresa na WAN interfejsu SPOKE rutera.
Obzirom da negdje imaš dinamičke adrese, biće problema, a tamo
gdje su satičke, mislim da bi ovako trebalo da radi. Možda i da ispitaš
da li može SPOKE da registruje NAT-ovane adrese kod NHRP servera,
to bi bilo pravo riješenje ako je moguće.
Ako prođe ping, čekiraj me za tačan odgovor :-)!
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