Site to site with same subnet

  • Hi,
    I have a question that i think i know the answer to, but need confirmation….
    I have 2 sites both with PFsense 2.0
    Site A network is and Site B is also
    Site A uses IP range 10.0.0.x / 10.1.0.x / 10.0.1.x and Site B uses 10.1.105.x
    Is an IPSec tunnel impossible ?

    I know it worked when Site A used and Site B used
    but i had to extend Site A's iprange....

    Any help will be appreciated.


  • How big mask you determined to site A? If i shake from the sleeve "right" mask it would be /15 or something like that and site B is summarized in there. –> so my first quess would be, it doesn't work unless you change site A's subnetting more continously like so /22 /21 /20 masks would work and then site B could be contacted with VPN again

  • Hi Metu69salemi,

    Thanks for the quick response.

    Maybe it'd just cause it after 1am, but im not making much sense of your reply…
    Could you put it in "lay-mans-terms" please  :)


  • I admit i might've been overlooked something badly, but this is what i mean

    In binary form: SITE A : 00001010.00000001.00000000.00000000 : 00001010.00000000.00000001.00000000 : 00001010.00000000.00000000.00000000 
    Site A SM: 11111111.11111110.00000000.00000000 = /15 ==
    and that means, that Site A covers anything between -- as local lan
    In binary form: SITE B 00001010.00000001.01101001.00000000
    Site B SM:  11111111.11111111.11111111.00000000 = /24 ==
    Is it possible to set Site A like 00001010.00000000.00000000.00000000 00001010.00000000.00000001.00000000 00001010.00000000.00000010.00000000
    SiteA SM: 11111111.11111111.11111100.00000000 = /22 ==

    And if something is local network, why to send it via vpn..

  • Aaahhhhh… it makes sense :)

    I will try in about 8 hrs and see what happens :)

    Thank you very much.

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