IPv6 Enkripsi: Contoh IPsec Tunnel Menggunakan racoon

Pada kesempatan ini akan di berikan contoh untuk membuat Ipsec tunnel menggunakan racoon pada dua gateway Linux berbasis sistem operasi Ubuntu 14.04. Gateway A: IPv6 2001:470:19:b37::100/64 VPN Network: 2002::/64 Gateway B: IPv6 2001:470:19:b37::101/64 VPN Network: 2003::/64 Kernel IP Forwarding Pada Gateway A dan Gateway B, kita perlu mengaktifkan kernel IP forwarding , echo 1 > /proc/sys/net/ipv4/conf/all/forwarding echo 1 > /proc/sys/net/ipv6/conf/all/forwarding Instalasi racoon dan ipsec-tools Pada Gateway A dan Gateway B, instalasi: # apt-get update # apt-get install racoon ipsec-tools

Pada pertanyaan “Configuration mode for racoon IKE daemon:” jawab “direct” Konfigurasi racoon Konfigurasi Gateway A Gateway A Konfigurasi /etc/racoon/racoon.conf log notify; path pre_shared_key "/etc/racoon/psk.txt"; remote 2001:470:19:b37::101 {

       exchange_mode main,aggressive; 
       proposal { 
               encryption_algorithm 3des; 
               hash_algorithm sha1; 
               authentication_method pre_shared_key; 
               dh_group 2; 
       } 

}

sainfo address 2002::/64 any address 2003::/64 any {

       pfs_group 2; 
       lifetime time 1 hour ; 
       encryption_algorithm 3des, blowfish 448, rijndael ; 
       authentication_algorithm hmac_sha1, hmac_md5 ; 
       compression_algorithm deflate ; 

}

Gateway A Konfigurasi /etc/racoon/psk.txt 2001:470:19:b37::101 a9993e364706816aba3e

Konfigurasi Gateway B Gateway B Konfigurasi /etc/racoon/racoon.conf log notify; path pre_shared_key "/etc/racoon/psk.txt"; remote 2001:470:19:b37::100 {

       exchange_mode main,aggressive; 
       proposal { 
               encryption_algorithm 3des; 
               hash_algorithm sha1; 
               authentication_method pre_shared_key; 
               dh_group 2; 
       } 

}

sainfo address 2003::/64 any address 2002::/64 any {

       pfs_group 2; 
       lifetime time 1 hour ; 
       encryption_algorithm 3des, blowfish 448, rijndael ; 
       authentication_algorithm hmac_sha1, hmac_md5 ; 
       compression_algorithm deflate ; 

}

Gateway B Konfigurasi /etc/racoon/psk.txt 2001:470:19:b37::100 a9993e364706816aba3e

Security Policies Konfigurasi Gateway A Gateway A Konfigurasi /etc/ipsec-tools.conf flush; spdflush; spdadd 2002::/64 2003::/64 any -P out ipsec

          esp/tunnel/2001:470:19:b37::100-2001:470:19:b37::101/require; 

spdadd 2003::/64 2002::/64 any -P in ipsec

          esp/tunnel/2001:470:19:b37::101-2001:470:19:b37::100/require; 

Konfigurasi Gateway B Gateway B Konfigurasi /etc/ipsec-tools.conf flush; spdflush; spdadd 2003::/64 2002::/64 any -P out ipsec

          esp/tunnel/2001:470:19:b37::101-2001:470:19:b37::100/require;

spdadd 2002::/64 2003::/64 any -P in ipsec

          esp/tunnel/2001:470:19:b37::100-2001:470:19:b37::101/require; 

Run Pada Gateway A maupun Gateway B jalankan perintah berikut /etc/init.d/setkey restart /etc/init.d/racoon restart

Akan tampak

• Flushing IPsec SA/SP database: [ OK ]
• Loading IPsec SA/SP database: [ OK ]
• Restarting IKE (ISAKMP/Oakley) server racoon [ OK ]

Cek /var/log/syslog # tail /var/log/syslog Akan keluar kira-kira Jul 7 07:42:01 server100 racoon: INFO: @(#)ipsec-tools 0.8.0 (http://ipsec-tools.sourceforge.net) Jul 7 07:42:01 server100 racoon: INFO: @(#)This product linked OpenSSL 1.0.1f 6 Jan 2014 (http://www.openssl.org/) Jul 7 07:42:01 server100 racoon: INFO: Reading configuration from "/etc/racoon/racoon.conf" Pastikan tidak ada error. Jika ada error timeout, restart ipsec dan racoon.

Pada Gateway A tambahkan routing ip -6 addr add 2002::1/64 dev eth0 ip -6 route add to 2003::/64 via 2002::1 src 2002::1

Pada Gateway B tambahkan routing ip -6 addr add 2003::1/64 dev eth0 ip -6 route add to 2002::/64 via 2003::1 src 2003::1

Setelah VPN tersambung, coba dari Gateway A: ping6 2003::1 Debugging Dari mesin Gateway B 2001:470:19:b37::101 Proses debugging jika dibutuhkan dapat menggunakan tcpdump dengan perintah, misalnya, # tcpdump -t -n -i eth0 -vv ip6 host 2001:470:19:b37::100