Strongswan zu strongswan ikev2 site to site

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Config is the same on both sites

ipsec.conf

Erklärung

Datei

conn s2s
     authby=secret
     keyexchange=ikev2
     left=10.82.227.12
     leftid=10.82.227.12
     leftsubnet=10.82.243.0/24
     mobike=no
     right=10.82.227.22
     rightid=10.82.227.22
     rightsubnet=10.82.244.0/24
     ike=aes256-sha256-modp4096!
     esp=aes256-sha256-modp4096!
     auto=start

ipsec.secrets

ID Kombination mit Authentifizierungsmethodes
10.82.227.12 10.82.227.22  : PSK "suxer"

Handling

Up

  • ipsec up s2s
initiating IKE_SA s2s[2] to 10.82.227.22
generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
sending packet: from 10.82.227.12[500] to 10.82.227.22[500] (720 bytes)
received packet: from 10.82.227.22[500] to 10.82.227.12[500] (728 bytes)
parsed IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(CHDLESS_SUP) N(MULT_AUTH) ]
selected proposal: IKE:AES_CBC_256/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/MODP_4096
authentication of '10.82.227.12' (myself) with pre-shared key
establishing CHILD_SA s2s{2}
generating IKE_AUTH request 1 [ IDi N(INIT_CONTACT) IDr AUTH SA TSi TSr N(MULT_AUTH) N(EAP_ONLY) N(MSG_ID_SYN_SUP) ]
sending packet: from 10.82.227.12[500] to 10.82.227.22[500] (256 bytes)
received packet: from 10.82.227.22[500] to 10.82.227.12[500] (224 bytes)
parsed IKE_AUTH response 1 [ IDr AUTH SA TSi TSr N(AUTH_LFT) ]
authentication of '10.82.227.22' with pre-shared key successful
IKE_SA s2s[2] established between 10.82.227.12[10.82.227.12]...10.82.227.22[10.82.227.22]
scheduling reauthentication in 10119s
maximum IKE_SA lifetime 10659s
selected proposal: ESP:AES_CBC_256/HMAC_SHA2_256_128/NO_EXT_SEQ
CHILD_SA s2s{2} established with SPIs cc16cb02_i c89d755d_o and TS 10.82.243.0/24 === 10.82.244.0/24
connection 's2s' established successfully

Down

  • ipsec down s2s
deleting IKE_SA s2s[2] between 10.82.227.12[10.82.227.12]...10.82.227.22[10.82.227.22]
sending DELETE for IKE_SA s2s[2]
generating INFORMATIONAL request 2 [ D ]
sending packet: from 10.82.227.12[500] to 10.82.227.22[500] (80 bytes)
received packet: from 10.82.227.22[500] to 10.82.227.12[500] (80 bytes)
parsed INFORMATIONAL response 2 [ ]
IKE_SA deleted
IKE_SA [2] closed successfully

Status

  • ipsec status s2s
Security Associations (1 up, 0 connecting):
         s2s[4]: ESTABLISHED 7 seconds ago, 10.82.227.12[10.82.227.12]...10.82.227.22[10.82.227.22]
         s2s{4}:  INSTALLED, TUNNEL, reqid 1, ESP SPIs: cef198fc_i c4de821a_o
         s2s{4}:   10.82.243.0/24 === 10.82.244.0/24

TCPDump der Verbindung

  • tcpdump -ni eth0 port 500 or esp
up
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
08:37:31.702968 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 1 I ident
08:37:31.707296 IP 10.82.227.22.500 > 10.82.227.12.500: isakmp: phase 1 R ident
08:37:31.764500 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 1 I ident
08:37:31.888131 IP 10.82.227.22.500 > 10.82.227.12.500: isakmp: phase 1 R ident
08:37:31.945758 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 1 I ident[E]
08:37:31.949075 IP 10.82.227.22.500 > 10.82.227.12.500: isakmp: phase 1 R ident[E]
08:37:32.018782 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 2/others I oakley-quick[E]
08:37:32.128716 IP 10.82.227.22.500 > 10.82.227.12.500: isakmp: phase 2/others R oakley-quick[E]
08:37:32.193586 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 2/others I oakley-quick[E]

down 

08:38:13.527180 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 2/others I inf[E]
08:38:13.527950 IP 10.82.227.12.500 > 10.82.227.22.500: isakmp: phase 2/others I inf[E]

Mehrere Subnetze

alice und tiazel

  • /etc/ipsec.conf
conn s2s
     authby=secret
     keyexchange=ikev2
     left=192.168.244.93
     leftid=@alice
     leftsubnet=172.16.93.0/24,10.16.93.0/24
     right=192.168.244.59
     rightid=@tiazel
     rightsubnet=172.16.59.0/24,10.16.59.0/24
     ike=aes256-sha1-modp1536
     esp=aes256-sha1-modp1536
     auto=start
  • ipsec status
Security Associations (1 up, 0 connecting):
         s2s[4]: ESTABLISHED 80 seconds ago, 192.168.244.93[alice]...192.168.244.59[tiazel]
         s2s{4}:  INSTALLED, TUNNEL, ESP SPIs: c0087b2d_i c3cf4303_o
         s2s{4}:   172.16.93.0/24 10.16.93.0/24 === 172.16.59.0/24 10.16.59.0/24

Links

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