IPSec VPN with Secondary IP Addresses

[Brustolin]

Hello guys,

Currently we have a necessity of deploying a lot of IPSec VPN's in different IP's from my WAN interface

For some reason that I don't know the VPN's only works if i enable "ping" with secondary addresses on Wan interface

Currently I have 31 IP's in secondary ips on my WAN. The FortiOS have a limitation of 32 IP's

If I don't enable ping, IPSec dont works and I receive this output

ike 0:ecea911495885ac4/0000000000000000:3203: responder: main mode get 1st message...
ike 0:ecea911495885ac4/0000000000000000:3203: VID DPD AFCAD71368A1F1C96B8696FC77570100
ike 0:ecea911495885ac4/0000000000000000:3203: VID FRAGMENTATION 4048B7D56EBCE88525E7DE7F00D6C2D3
ike 0:ecea911495885ac4/0000000000000000:3203: VID FRAGMENTATION 4048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:ecea911495885ac4/0000000000000000:3203: VID FORTIGATE 8299031757A36082C6A621DE00000000
ike 0:ecea911495885ac4/0000000000000000:3203: negotiation result
ike 0:ecea911495885ac4/0000000000000000:3203: proposal id = 1:
ike 0:ecea911495885ac4/0000000000000000:3203: protocol id = ISAKMP:
ike 0:ecea911495885ac4/0000000000000000:3203: trans_id = KEY_IKE.
ike 0:ecea911495885ac4/0000000000000000:3203: encapsulation = IKE/none
ike 0:ecea911495885ac4/0000000000000000:3203: type=OAKLEY_ENCRYPT_ALG, val=AES_CBC, key-len=128
ike 0:ecea911495885ac4/0000000000000000:3203: type=OAKLEY_HASH_ALG, val=SHA.
ike 0:ecea911495885ac4/0000000000000000:3203: type=AUTH_METHOD, val=PRESHARED_KEY.
ike 0:ecea911495885ac4/0000000000000000:3203: type=OAKLEY_GROUP, val=MODP1536.
ike 0:ecea911495885ac4/0000000000000000:3203: ISAKMP SA lifetime=86400
ike 0:ecea911495885ac4/0000000000000000:3203: SA proposal chosen, matched gateway VPN_WINOV_SP
ike 0: found VPN_WINOV_SP 200.195.149.26 6 -> 170.231.15.66:500
ike 0:VPN_WINOV_SP:3203: peer is FortiGate/FortiOS (v0 b0)
ike 0:VPN_WINOV_SP:3203: cookie ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (ident_r1send): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0: comes 170.231.15.66:500->200.195.149.26:500,ifindex=6,vrf=0....
ike 0: IKEv1 exchange=Identity Protection id=ecea911495885ac4/0000000000000000 len=172 vrf=0
ike 0: in ECEA911495885AC400000000000000000110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000144048B7D56EBCE88525E7DE7F00D6C2D30D0000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000000000148299031757A36082C6A621DE00000000
ike 0:VPN_WINOV_SP:3203: retransmission, re-send last message
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (retransmit): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (P1_RETRANSMIT): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: IPsec SA connect 6 200.195.149.26->170.231.15.66:0
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: using existing connection
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: config found
ike 0:VPN_WINOV_SP: request is on the queue
ike 0: comes 170.231.15.66:500->200.195.149.26:500,ifindex=6,vrf=0....
ike 0: IKEv1 exchange=Identity Protection id=ecea911495885ac4/0000000000000000 len=172 vrf=0
ike 0: in ECEA911495885AC400000000000000000110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000144048B7D56EBCE88525E7DE7F00D6C2D30D0000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000000000148299031757A36082C6A621DE00000000
ike 0:VPN_WINOV_SP:3203: retransmission, re-send last message
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (retransmit): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (P1_RETRANSMIT): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: IPsec SA connect 6 200.195.149.26->170.231.15.66:0
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: using existing connection
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: config found
ike 0:VPN_WINOV_SP: request is on the queue
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: IPsec SA connect 6 200.195.149.26->170.231.15.66:0
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: using existing connection
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: config found
ike 0:VPN_WINOV_SP: request is on the queue
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: IPsec SA connect 6 200.195.149.26->170.231.15.66:0
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: using existing connection
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: config found
ike 0:VPN_WINOV_SP: request is on the queue
ike 0: comes 170.231.15.66:500->200.195.149.26:500,ifindex=6,vrf=0....
ike 0: IKEv1 exchange=Identity Protection id=ecea911495885ac4/0000000000000000 len=172 vrf=0
ike 0: in ECEA911495885AC400000000000000000110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000144048B7D56EBCE88525E7DE7F00D6C2D30D0000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000000000148299031757A36082C6A621DE00000000
ike 0:VPN_WINOV_SP:3203: retransmission, re-send last message
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (retransmit): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:3203: out ECEA911495885AC44FEA753EB08576F20110020000000000000000AC0D00003C000000010000000100000030010100010000002801010000800B0001000C00040001518080010007800E00808003000180020002800400050D000014AFCAD71368A1F1C96B8696FC775701000D0000148299031757A36082C6A621DE000000000D0000144048B7D56EBCE88525E7DE7F00D6C2D3000000184048B7D56EBCE88525E7DE7F00D6C2D3C0000000
ike 0:VPN_WINOV_SP:3203: sent IKE msg (P1_RETRANSMIT): 200.195.149.26:500->170.231.15.66:500, len=172, vrf=0, id=ecea911495885ac4/4fea753eb08576f2
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: IPsec SA connect 6 200.195.149.26->170.231.15.66:0
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: using existing connection
ike 0:VPN_WINOV_SP:VPN_WINOV_SP: config found
ike 0:VPN_WINOV_SP: request is on the queue
ike 0:VPN_WINOV_SP:3201: d3fcd5f5f857c37f/0000000000000000 negotiation of IKE SA failed due to retry timeout
ike 0:VPN_WINOV_SP:3201: expiring IKE SA d3fcd5f5f857c37f/0000000000000000
ike 0:VPN_WINOV_SP: deleting
ike 0:VPN_WINOV_SP: deleted

Am I doing something wrong?

Thanks

[srajeswaran]

During the problem state, can you take a sniffer on the specific interface and check if there are proper ARP Requests/replies?

To capture only ARP Packets.

diagnose sniffer packet <interface name> "ether proto 0x0806" 4

and then capture the transactions between peers.

diagnose sniffer packet <interface name> "host 200.195.149.26 and host 170.231.15.66" 6

Also, do you have DPD enabled? if so, can you try disabling the dpd and check?