1. Add peer (with phase1 configuration parameters), DES and SHA1 will be used to protect IKE
traffic
• for MikroTik router
[admin@MikroTik] > ip ipsec peer add address=10.0.1.2 \
\... secret="gvejimezyfopmekun" enc-algorithm=des
• for CISCO router
! Configure ISAKMP policy (phase1 config, must match configuration
! of "/ip ipsec peer" on RouterOS). Note that DES is default
! encryption algorithm on Cisco. SHA1 is default authentication
! algorithm
crypto isakmp policy 9
encryption des
authentication pre-share
group 2
hash md5
exit
! Add preshared key to be used when talking to RouterOS
crypto isakmp key gvejimezyfopmekun address 10.0.1.1 255.255.255.255
2. Set encryption proposal (phase2 proposal - settings that will be used to encrypt actual data) to
use DES to encrypt data
• for MikroTik router
[admin@MikroTik] > ip ipsec proposal set default enc-algorithms=des
• for CISCO router
! Create IPsec transform set - transformations that should be applied to
! traffic - ESP encryption with DES and ESP authentication with SHA1
! This must match "/ip ipsec proposal"
crypto ipsec transform-set myset esp-des esp-sha-hmac
mode tunnel
exit
3. Add policy rule that matches traffic between subnets and requires encryption with ESP in
tunnel mode
• for MikroTik router
[admin@MikroTik] > ip ipsec policy add \
\... src-address=10.0.0.0/24 dst-address=10.0.2.0/24 action=encrypt \
\... tunnel=yes sa-src=10.0.1.1 sa-dst=10.0.1.2
• for CISCO router
! Create access list that matches traffic that should be encrypted
access-list 101 permit ip 10.0.2.0 0.0.0.255 10.0.0.0 0.0.0.255
! Create crypto map that will use transform set "myset", use peer 10.0.1.1
! to establish SAs and encapsulate traffic and use access-list 101 to
! match traffic that should be encrypted
crypto map mymap 10 ipsec-isakmp
set peer 10.0.1.1
set transform-set myset
set pfs group2
match address 101
exit
! And finally apply crypto map to serial interface:
interface Serial 0
crypto map mymap
exit
Page 316 of 695
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