Cisco (876 Integrated Services Router )and (881 Integrated Services Router) IOS Software

[CSCO12763054]

Hi 

I have two type Cisco Router different location, I want to connection all router with PaloAlto use protocol IPSEC VPN 

one of them is  Cisco 876 Integrated Services Router

one of them is  Cisco 881 Integrated Services Router 

how can I  update firmware Cisco 876 from Version 12.4 to Version 15.1 ??

                                             Cisco 881 from Version 15.1 to Version 15.6 ??

what kind of Ipsec vpn types between Cisco Router and PaloAlto ?

How can I do ıpsec vpn between Cisco Router and PaloAlto ?

What is difference between Cisco 876  Version 12.4 and  Version 15.1 about doing to ıpsec vpn ? 

Thank you for your helps

Sincerely 

[Georg Pauwen]

Hello,

the IOS version currently running on your routers might already be sufficient for IPSec VPN configuration. Either way, there are a lot of differences between 12.4 and 15.1. The best way to see them all is to go to the Feature Navigator and compare two software releases:

http://cfn.cloudapps.cisco.com/ITDIT/CFN/jsp/compareImages.jsp