VPN Implimentation IPSec/GRE Tunnel using 1720 and 831 Routers

Discussion in 'Cisco' started by Ali, Nov 4, 2003.

  1. Ali

    Ali Guest

    At each site I have ADSL connections to the internet, with static IP
    addresses. The Cisco 831 has two ethernet ports in it and so does the 1720,
    both routers have the nessasary IOS versions for a IPSec/GRE tunnel. I will
    connect each router to the ADSL modem via one of their Ethernet ports and
    the second ethernet port will be for the LAN. The connection between the
    cisco devices and the adsl will be using nat, im just wondering if this will
    be any problem for me or will nat-t do it's magic here ?
    Ali, Nov 4, 2003
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  2. Ali

    Ali Guest

    initially it will be just 2 sites, 1 branch office with the cisco 831, and 1
    head end router at hq, a cisco1721. i don't want slpit tunneling at either
    end, the tunnel between the sites will be IPsec/GRE.

    im concerned that these two cisco devices the 1721 and the 831 may not be
    able to do an IPSec tunnel because they are not directly connected to the
    internet eg. by an adsl wic, but instead their connection to the internet
    will be given by a 3rd party ( nokia ), adsl router. Will having the third
    party adsl router cause me problems ?
    or do i need to use adsl wic's ?

    Thanks, hope this is helpful.
    Ali, Nov 5, 2003
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  3. Ali

    chris Guest

    I am a little confused. Are you saying you have many sites that will
    have LAN 2 LAN tunnels using GRE/IPSEC and at each site there will be
    split tunneling to the internet?
    chris, Nov 5, 2003
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