Cisco Cisco IOS Software Release 12.2(8)YM

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The following sections list the new hardware and software features supported by Release 12.2(8)YM for 
the SOHO 70 Series Routers and the Cisco 800 Series Routers.

The following sections list the new software features supported by Cisco IOS Release 12.2(8)YM1 on 
the and the Cisco 800 Series Routers.

Hot Standby Router protocol (HSRP) enables a set of routers to work together to present the appearance 
of a single virtual router or default gateway to the hosts on a LAN. HSRP is particularly useful in 
environments where critical applications are running and fault-tolerant networks have been designed. By 
sharing an IP address and a MAC address two or more routers acting as one virtual router are able to 
seamlessly assume the routing responsibility in the case of a defined event or the unexpected failure. This 
enables hosts on a LAN to continue to forward IP packets to a consistent IP and MAC address enabling 
the changeover of devices doing the routing to be transparent to them and their sessions.

Refer to

 Software Enhancements for the Cisco 800 Routers and SOHO Routers

for more information on 

this feature.

Domain Name System (DNS) proxy enables the router to act as a Proxy DNS server. This means that it 
will receive DNS queries on behalf of the real DNS servers and proxy for hosts connected to the LAN. 
This enables the DHCP server to immediately send hosts on the LAN the router's own LAN address as 
the DNS server IP address. The router then forwards the DNS queries from local users to real DNS 
servers after the WAN connection is initiated, and it caches the DNS records in the answers.