Same-Remote
This scenario shows how to configure a VPN responder that can receive incoming connections from the same virtual IP address.
Test Site-To-Site With Same Remote Address
Description
VPN site-to-site configuration to connect two subnets to an end-point using the same virtual IP address.
Scenario
Attention
In order to make this scenario work, the device needs a way to respond and reinject traffic through the appropriate VPN tunnel. This can be achieved by copying the packet mark into the conntrack mark and restoring it later. Therefore, the following configuration lines are needed:
Show output
set vpn ipsec esp-group CHILD-SA mark-in unique set vpn ipsec esp-group CHILD-SA mark-out unique set traffic policy IN_MARK_TO_FLOW rule 1 copy mark connmark set traffic policy OUT_FLOW_TO_MARK rule 1 copy connmark mark set interfaces eth0 traffic policy in IN_MARK_TO_FLOW set interfaces dum0 traffic policy local-out OUT_FLOW_TO_MARK
Step 1: Set the following configuration in DUT0
:
set interfaces dummy dum0 address 10.1.0.1/24 set interfaces dummy dum0 traffic policy local-out OUT_FLOW_TO_MARK set interfaces ethernet eth0 address 80.0.0.1/24 set interfaces ethernet eth0 traffic policy in IN_MARK_TO_FLOW set protocols static route 0.0.0.0/0 interface dum0 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set traffic policy IN_MARK_TO_FLOW rule 1 copy mark connmark set traffic policy OUT_FLOW_TO_MARK rule 1 copy connmark mark set vpn ipsec auth-profile AUTH-SA local auth encrypted-pre-shared-secret U2FsdGVkX1+PDuBkbNEVsOO8GXXf+rh6swxGAy69QWQ= set vpn ipsec esp-group CHILD-SA mark-in unique set vpn ipsec esp-group CHILD-SA mark-out unique set vpn ipsec esp-group CHILD-SA proposal 1 encryption aes256gcm128 set vpn ipsec esp-group CHILD-SA proposal 1 pfs dh-group19 set vpn ipsec ike-group IKE-SA key-exchange ikev2 set vpn ipsec ike-group IKE-SA proposal 1 dh-group 19 set vpn ipsec ike-group IKE-SA proposal 1 encryption aes256gcm128 set vpn ipsec ike-group IKE-SA proposal 1 hash sha256 set vpn ipsec site-to-site peer PEER auth-profile AUTH-SA set vpn ipsec site-to-site peer PEER connection-type respond set vpn ipsec site-to-site peer PEER default-esp-group CHILD-SA set vpn ipsec site-to-site peer PEER ike-group IKE-SA set vpn ipsec site-to-site peer PEER local-address 80.0.0.1 set vpn ipsec site-to-site peer PEER tunnel 1 local prefix 10.1.0.0/24 set vpn ipsec site-to-site peer PEER tunnel 1 local-interface dum0 set vpn ipsec site-to-site peer PEER tunnel 1 remote prefix 0.0.0.0/0
Step 2: Set the following configuration in DUT1
:
set interfaces dummy dum0 address 10.3.0.1/24 set interfaces ethernet eth0 address 80.0.0.2/24 set protocols static route 0.0.0.0/0 next-hop 80.0.0.1 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set vpn ipsec auth-profile AUTH-SA local auth encrypted-pre-shared-secret U2FsdGVkX18xKU2Nx1dk2TOlhNIClu4g2OOZgv8/cYo= set vpn ipsec esp-group CHILD-SA proposal 1 encryption aes256gcm128 set vpn ipsec esp-group CHILD-SA proposal 1 pfs dh-group19 set vpn ipsec ike-group IKE-SA key-exchange ikev2 set vpn ipsec ike-group IKE-SA proposal 1 dh-group 19 set vpn ipsec ike-group IKE-SA proposal 1 encryption aes256gcm128 set vpn ipsec ike-group IKE-SA proposal 1 hash sha256 set vpn ipsec site-to-site peer PEER auth-profile AUTH-SA set vpn ipsec site-to-site peer PEER connection-type initiate set vpn ipsec site-to-site peer PEER default-esp-group CHILD-SA set vpn ipsec site-to-site peer PEER ike-group IKE-SA set vpn ipsec site-to-site peer PEER local-address 80.0.0.2 set vpn ipsec site-to-site peer PEER remote-address 80.0.0.1 set vpn ipsec site-to-site peer PEER tunnel 1 local prefix 10.3.0.0/24 set vpn ipsec site-to-site peer PEER tunnel 1 remote prefix 10.1.0.0/24
Step 3: Set the following configuration in DUT2
:
set interfaces dummy dum0 address 10.3.0.1/24 set interfaces ethernet eth0 address 80.0.0.3/24 set protocols static route 0.0.0.0/0 next-hop 80.0.0.1 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' set vpn ipsec auth-profile AUTH-SA local auth encrypted-pre-shared-secret U2FsdGVkX1/CyvrpMp9lp84CYEE6UHGKDL+9AKw6PX4= set vpn ipsec esp-group CHILD-SA proposal 1 encryption aes256gcm128 set vpn ipsec esp-group CHILD-SA proposal 1 pfs dh-group19 set vpn ipsec ike-group IKE-SA key-exchange ikev2 set vpn ipsec ike-group IKE-SA proposal 1 dh-group 19 set vpn ipsec ike-group IKE-SA proposal 1 encryption aes256gcm128 set vpn ipsec ike-group IKE-SA proposal 1 hash sha256 set vpn ipsec site-to-site peer PEER auth-profile AUTH-SA set vpn ipsec site-to-site peer PEER connection-type initiate set vpn ipsec site-to-site peer PEER default-esp-group CHILD-SA set vpn ipsec site-to-site peer PEER ike-group IKE-SA set vpn ipsec site-to-site peer PEER local-address 80.0.0.3 set vpn ipsec site-to-site peer PEER remote-address 80.0.0.1 set vpn ipsec site-to-site peer PEER tunnel 1 local prefix 10.3.0.0/24 set vpn ipsec site-to-site peer PEER tunnel 1 remote prefix 10.1.0.0/24
Step 4: Ping IP address 80.0.0.2
from DUT0
:
admin@DUT0$ ping 80.0.0.2 count 1 size 56 timeout 1Show output
PING 80.0.0.2 (80.0.0.2) 56(84) bytes of data. 64 bytes from 80.0.0.2: icmp_seq=1 ttl=64 time=0.343 ms --- 80.0.0.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.343/0.343/0.343/0.000 ms
Step 5: Ping IP address 80.0.0.3
from DUT0
:
admin@DUT0$ ping 80.0.0.3 count 1 size 56 timeout 1Show output
PING 80.0.0.3 (80.0.0.3) 56(84) bytes of data. 64 bytes from 80.0.0.3: icmp_seq=1 ttl=64 time=1.06 ms --- 80.0.0.3 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.058/1.058/1.058/0.000 ms
Step 6: Run command vpn ipsec show sa
at DUT0
and check if output contains the following tokens:
80.0.0.2 80.0.0.3Show output
vpn-peer-PEER: #2, ESTABLISHED, IKEv2, 1b9867798c036ccc_i 0fe4e2d047840fec_r* local '80.0.0.1' @ 80.0.0.1[500] remote '80.0.0.3' @ 80.0.0.3[500] AES_GCM_16-256/PRF_HMAC_SHA2_256/ECP_256 established 1s ago, rekeying in 18830s peer-PEER-tunnel-1: #2, reqid 2, INSTALLED, TUNNEL, ESP:AES_GCM_16-256 installed 1s ago, rekeying in 3294s, expires in 3959s in ceee95fa (0x00000002), 0 bytes, 0 packets out c469ea27 (0x00000002), 0 bytes, 0 packets local 10.1.0.0/24 remote 10.3.0.0/24 vpn-peer-PEER: #1, ESTABLISHED, IKEv2, 5fa05dcbe0cbdf0d_i d9a4c42da507cf50_r* local '80.0.0.1' @ 80.0.0.1[500] remote '80.0.0.2' @ 80.0.0.2[500] AES_GCM_16-256/PRF_HMAC_SHA2_256/ECP_256 established 3s ago, rekeying in 19897s peer-PEER-tunnel-1: #1, reqid 1, INSTALLED, TUNNEL, ESP:AES_GCM_16-256 installed 3s ago, rekeying in 3300s, expires in 3957s in c8b9b2cd (0x00000001), 0 bytes, 0 packets out c9a98579 (0x00000001), 0 bytes, 0 packets local 10.1.0.0/24 remote 10.3.0.0/24
Step 7: Ping IP address 10.1.0.1
from DUT1
:
admin@DUT1$ ping 10.1.0.1 local-address 10.3.0.1 count 1 size 56 timeout 1Show output
PING 10.1.0.1 (10.1.0.1) from 10.3.0.1 : 56(84) bytes of data. 64 bytes from 10.1.0.1: icmp_seq=1 ttl=64 time=0.519 ms --- 10.1.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.519/0.519/0.519/0.000 ms
Step 8: Ping IP address 10.1.0.1
from DUT2
:
admin@DUT2$ ping 10.1.0.1 local-address 10.3.0.1 count 1 size 56 timeout 1Show output
PING 10.1.0.1 (10.1.0.1) from 10.3.0.1 : 56(84) bytes of data. 64 bytes from 10.1.0.1: icmp_seq=1 ttl=64 time=1.35 ms --- 10.1.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.346/1.346/1.346/0.000 ms
Step 9: Run command vpn ipsec show sa remote 80.0.0.2
at DUT0
and check if output matches the following regular expressions:
[1-9]\d? packetsShow output
vpn-peer-PEER: #1, ESTABLISHED, IKEv2, 5fa05dcbe0cbdf0d_i d9a4c42da507cf50_r* local '80.0.0.1' @ 80.0.0.1[500] remote '80.0.0.2' @ 80.0.0.2[500] AES_GCM_16-256/PRF_HMAC_SHA2_256/ECP_256 established 3s ago, rekeying in 19897s peer-PEER-tunnel-1: #1, reqid 1, INSTALLED, TUNNEL, ESP:AES_GCM_16-256 installed 3s ago, rekeying in 3300s, expires in 3957s in c8b9b2cd (0x00000001), 84 bytes, 1 packets, 0s ago out c9a98579 (0x00000001), 84 bytes, 1 packets, 0s ago local 10.1.0.0/24 remote 10.3.0.0/24
Step 10: Run command vpn ipsec show sa remote 80.0.0.3
at DUT0
and check if output matches the following regular expressions:
[1-9]\d? packetsShow output
vpn-peer-PEER: #2, ESTABLISHED, IKEv2, 1b9867798c036ccc_i 0fe4e2d047840fec_r* local '80.0.0.1' @ 80.0.0.1[500] remote '80.0.0.3' @ 80.0.0.3[500] AES_GCM_16-256/PRF_HMAC_SHA2_256/ECP_256 established 1s ago, rekeying in 18830s peer-PEER-tunnel-1: #2, reqid 2, INSTALLED, TUNNEL, ESP:AES_GCM_16-256 installed 1s ago, rekeying in 3294s, expires in 3959s in ceee95fa (0x00000002), 84 bytes, 1 packets, 0s ago out c469ea27 (0x00000002), 84 bytes, 1 packets, 0s ago local 10.1.0.0/24 remote 10.3.0.0/24
Attention
The command vpn show ipsec policy
can be used to debug
the IPSec selectors that have been installed in OSDx devices.
Example for device DUT0
:
Show output
src 10.1.0.0/24 dst 10.3.0.0/24 dev dum0 dir out priority 375421 mark 0x2/0xffffffff tmpl src 80.0.0.1 dst 80.0.0.3 proto esp spi 0xc469ea27 reqid 2 mode tunnel src 10.3.0.0/24 dst 10.1.0.0/24 dir fwd priority 375423 mark 0x2/0xffffffff tmpl src 80.0.0.3 dst 80.0.0.1 proto esp reqid 2 mode tunnel src 10.3.0.0/24 dst 10.1.0.0/24 dir in priority 375423 mark 0x2/0xffffffff tmpl src 80.0.0.3 dst 80.0.0.1 proto esp reqid 2 mode tunnel src 10.1.0.0/24 dst 10.3.0.0/24 dev dum0 dir out priority 375421 mark 0x1/0xffffffff tmpl src 80.0.0.1 dst 80.0.0.2 proto esp spi 0xc9a98579 reqid 1 mode tunnel src 10.3.0.0/24 dst 10.1.0.0/24 dir fwd priority 375423 mark 0x1/0xffffffff tmpl src 80.0.0.2 dst 80.0.0.1 proto esp reqid 1 mode tunnel src 10.3.0.0/24 dst 10.1.0.0/24 dir in priority 375423 mark 0x1/0xffffffff tmpl src 80.0.0.2 dst 80.0.0.1 proto esp reqid 1 mode tunnel src 0.0.0.0/0 dst 0.0.0.0/0 socket in priority 0 src 0.0.0.0/0 dst 0.0.0.0/0 socket out priority 0 src 0.0.0.0/0 dst 0.0.0.0/0 socket in priority 0 src 0.0.0.0/0 dst 0.0.0.0/0 socket out priority 0 src ::/0 dst ::/0 socket in priority 0 src ::/0 dst ::/0 socket out priority 0 src ::/0 dst ::/0 socket in priority 0 src ::/0 dst ::/0 socket out priority 0