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IPSec is a framework consisting of protocols and algorithms for protecting data through an un-trusted network such as the internet. IPSec’s protocol objective is to provide security services encrypting sensitive data, authentication, protection and confidentiality.
Topology
Instructions
The first step is to configure the interfaces, establish the layer-3 reachability between IPSec tunnel source and destination. Configure the tunnel interface with encapsulation type, specify the tunnel source/remote IP
Configure IPSec parameters for ESP-group and IKE-group with “encryption” and “hash” protocol along with IKE version type to be used
Configure IPSec site-to-site configuration with local and remote peer IP, authentication mode/pre-shared-key, tunnel interface with local/remote prefix for the intended data traffic
Verify the IPSec and IKE tunnel is UP using show commands
Send end-to-end traffic, validate flows are getting encrypted/decrypted at tunnel source/destination end respectively
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show vpn ipsec sa
vyatta@danos-vnf1:~$ show vpn ipsec sa
Peer ID / IP Local ID / IP
------------ -------------
150.1.1.1 140.1.1.1
Tunnel Id State Bytes Out/In Encrypt Hash DH A-Time L-Time
------ ---------- ----- ------------- ------------ -------- -- ------ ------
0 565 up 2.3K/2.3K aes128gcm128 null n/a 2562 3600
show vpn ipsec status
IPsec Process Running PID: 7020 > Confirm the IPsec process is running
vyatta@danos-vnf1:~$ show vpn ipsec sa
Peer ID / IP Local ID / IP
------------ -------------
150.1.1.1 140.1.1.1
Tunnel Id State Bytes Out/In Encrypt Hash DH A-Time L-Time
------ ---------- ----- ------------- ------------ -------- -- ------ ------
0 563 up 0.0/0.0 aes128gcm128 null n/a 1197 3600
show vpn ipsec state
vyatta@danos-vnf1:~$ show vpn ipsec state
src 140.1.1.1 dst 150.1.1.1
proto esp spi 0xc6708774 reqid 1 mode tunnel
replay-window 0 flag af-unspec
aead rfc4106(gcm(aes)) 0x925793c6057be9a41d9726cd94a3ddb13415e8d0 128
anti-replay context: seq 0x0, oseq 0x0, bitmap 0x00000000
src 150.1.1.1 dst 140.1.1.1
proto esp spi 0xcb9137ef reqid 1 mode tunnel
replay-window 0 flag af-unspec
aead rfc4106(gcm(aes)) 0x4bee7aa173090d179632f0c04c77ddaca7b43927 128
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Validation
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Finally, to validate IPSec tunnel is able to encrypt/decrypt the packets for configure local/remote prefix - Send ICMP ping packets from Lan1 (10.1.1.0/24) to Lan2 (172.16.1.0/24) network
vyatta@danos-vnf1:~$ ping 172.16.1.1 interface 10.1.1.1 (snipped o/p)
PING 172.16.1.1 (172.16.1.1) from 10.1.1.1 : 56(84) bytes of data.
64 bytes from 172.16.1.1: icmp_seq=1 ttl=64 time=5.46 ms
64 bytes from 172.16.1.1: icmp_seq=2 ttl=64 time=3.38 ms
64 bytes from 172.16.1.1: icmp_seq=3 ttl=64 time=6.26 ms
show vpn ipsec sa
Peer ID / IP Local ID / IP
------------ -------------
140.1.1.1 150.1.1.1
Tunnel Id State Bytes Out/In Encrypt Hash DH A-Time L-Time
------ ---------- ----- ------------- ------------ -------- -- ------ ------
0 633 up 672.0/672.0 aes128gcm128 null n/a 1244 3600
show vpn ipsec sa
Peer ID / IP Local ID / IP
------------ -------------
140.1.1.1 150.1.1.1
Tunnel Id State Bytes Out/In Encrypt Hash DH A-Time L-Time
------ ---------- ----- ------------- ------------ -------- -- ------ ------
0 633 up 1.8K/1.8K aes128gcm128 null n/a 1284 3600
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Troubleshooting / Debug commands
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show log vpn all
show log vpn ipsec
show vpn debug
Possible completions:
<Enter> Execute the current command
detail Show detailed VPN debugging information
peer Show debugging information for a peer
show vpn debug peer 150.1.1.1
shunt-peer-150.1.1.1-tunnel-0: %any...%any IKEv1
shunt-peer-150.1.1.1-tunnel-0: local: uses public key authentication
shunt-peer-150.1.1.1-tunnel-0: remote: uses public key authentication
shunt-peer-150.1.1.1-tunnel-0: child: 10.1.1.0/24 === 172.16.1.0/24 DROP
peer-150.1.1.1-tunnel-0: 140.1.1.1...150.1.1.1 IKEv2
peer-150.1.1.1-tunnel-0: local: [140.1.1.1] uses pre-shared key authentication
peer-150.1.1.1-tunnel-0: remote: uses pre-shared key authentication
peer-150.1.1.1-tunnel-0: child: 10.1.1.0/24 === 172.16.1.0/24 TUNNEL
shunt-peer-150.1.1.1-tunnel-0: 10.1.1.0/24 === 172.16.1.0/24 DROP
peer-150.1.1.1-tunnel-0[24]: ESTABLISHED 3 hours ago, 140.1.1.1[500][140.1.1.1]...150.1.1.1[500][150.1.1.1]
peer-150.1.1.1-tunnel-0[24]: IKEv2 SPIs: a9122ec476067169_i 6e154e0afe6d0a04_r*, pre-shared key reauthentication in 4 hours
peer-150.1.1.1-tunnel-0[24]: IKE proposal: AES_GCM_16_128/PRF_HMAC_SHA2_512/MODP_1536
peer-150.1.1.1-tunnel-0{189}: INSTALLED, TUNNEL, reqid 14, ESP SPIs: cbc4b9e9_i c3360c54_o
peer-150.1.1.1-tunnel-0{189}: AES_GCM_16_128/MODP_1536, 0 bytes_i, 0 bytes_o, rekeying in 34 minutes
peer-150.1.1.1-tunnel-0{189}: 10.1.1.0/24 === 172.16.1.0/24 |
How to check it is working or ideas on how to troubleshoot.
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