IPSec 設定筆記

參考

http://taosecurity.blogspot.com/2005/01/ipsec-tunnels-with-freebsd-although.html

  1. 修改 Kernel,加上

    options FAST_IPSEC
    device crypto

    並且重開機。

  2. 安裝 security/ipsec-tools
  3. 設定 /usr/local/etc/racoon/racoon.conf:

    path pre_shared_key "/usr/local/etc/racoon/psk.txt";
    padding
    {
    maximum_length 20; # maximum padding length.
    randomize off; # enable randomize length.
    strict_check off; # enable strict check.
    exclusive_tail off; # extract last one octet.
    }

    listen
    {
    isakmp (MY_IP) [500];
    }
    timer
    {
    # These value can be changed per remote node.
    counter 5; # maximum trying count to send.
    interval 20 sec; # maximum interval to resend.
    persend 1; # the number of packets per send.

    # maximum time to wait for completing each phase.
    phase1 30 sec;
    phase2 15 sec;
    }
    remote
    [500]
    {
    #exchange_mode main,aggressive;
    exchange_mode aggressive,main;
    doi ipsec_doi;
    situation identity_only;

    my_identifier user_fqdn “sakane@kame.net”;
    peers_identifier user_fqdn “sakane@kame.net”;
    #certificate_type x509 “mycert” “mypriv”;

    nonce_size 16;
    lifetime time 1 min; # sec,min,hour

    proposal {
    encryption_algorithm 3des;
    hash_algorithm sha1;
    authentication_method pre_shared_key;
    dh_group 2;
    }
    }

  4. 設定 /usr/local/share/psk.txt:
  5. 設定 /etc/ipsec.conf:
    flush;
    spdflush;spdadd any -P out ipsec
    esp/tunnel/-/require;
    spdadd any -P in ipsec
    esp/tunnel/-/require;

    spdadd / any -P out ipsec
    esp/tunnel/-/require;

    spdadd / any -P in ipsec
    esp/tunnel/-/require;

  6. /usr/local/etc/rc.d/racoon.sh start; /etc/rc.d/ipsec start;

P.S.
racoon 的範例設定檔在 /usr/local/share/examples/ipsec-tools 裡面。

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