1. VSNL
Sify
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Internal Network /
Default gateway is
/24 is the serial interface on my 1721 router
/24 are the IP’s provided by my ISP.
Ethernet IP of my firewall (ouside Interface) is /24
Other Service Provided’s IP are /24
In my firewall I have nated my private IP to public interface of firewall.
This configuration works well with out redundancy. All Traffic from my
private network is routed to VSNL..
I have to now build redundancy such that if VSNL Link fails all traffic is
Diverted to SIFY.
I have configured cisco 2801 ethernet interface to have valid ip provided
By VSNL so that I can build HSRP.
Cisco 2801 is coming active if VSNL circuit fails but my internet traffic is
No reaching Internet.
/24 Standby IP.
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