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pierrec
pierrec
New Member
May 3, 2022
Question

IPSEC Tunnel between Fortigate and TP-Link MR 600

  • May 3, 2022
  • 2 replies
  • 6272 views

Hi,

I'm trying do do IPSEC between my Fortigate and a TP-Link MR 600 (4G router).

My Fortigate is traversing NAT.

The configuration seems fine on both ends but the phase 1 don't go up.

Here are the log messages (public IPs have been anonymised), I do not know what to look for :

Spoiler
ike 0:test-4g: schedule auto-negotiate
ike 0:test-4g:12625051: initiator: main mode is sending 1st message...
ike 0:test-4g:12625051: cookie 53b3a340214e0b8a/0000000000000000
ike 0:test-4g:12625051: out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
ike 0:test-4g:12625051: sent IKE msg (ident_i1send): X.X.X.X:500->X.X.X.X:500, len=288, id=53b3a340214e0b8a/0000000000000000
ike 0: comes X.X.X.X:500->X.X.X.X:500,ifindex=351....
ike 0: IKEv1 exchange=Identity Protection id=53b3a340214e0b8a/469f4ffb9008ead7 len=160
ike 0: in 53B3A340214E0B8A469F4FFB9008EAD70110020000000000000000A00D00003800000001000000010000002C01010001000000240101000080010007800E0100800200018004000580030001800B0001800C0E100D00000C09002689DFD6B7120D000014AFCAD71368A1F1C96B8696FC775701000D0000184048B7D56EBCE88525E7DE7F00D6C2D380000000000000144A131C81070358455C5728F20E95452F
ike 0:test-4g:12625051: initiator: main mode get 1st response...
ike 0:test-4g:12625051: VID draft-ietf-ipsra-isakmp-xauth-06.txt 09002689DFD6B712
ike 0:test-4g:12625051: VID DPD AFCAD71368A1F1C96B8696FC77570100
ike 0:test-4g:12625051: DPD negotiated
ike 0:test-4g:12625051: VID FRAGMENTATION 4048B7D56EBCE88525E7DE7F00D6C2D380000000
ike 0:test-4g:12625051: VID RFC 3947 4A131C81070358455C5728F20E95452F
ike 0:test-4g:12625051: selected NAT-T version: RFC 3947
ike 0:test-4g:12625051: negotiation result
ike 0:test-4g:12625051: proposal id = 1:
ike 0:test-4g:12625051: protocol id = ISAKMP:
ike 0:test-4g:12625051: trans_id = KEY_IKE.
ike 0:test-4g:12625051: encapsulation = IKE/none
ike 0:test-4g:12625051: type=OAKLEY_ENCRYPT_ALG, val=AES_CBC, key-len=256
ike 0:test-4g:12625051: type=OAKLEY_HASH_ALG, val=MD5.
ike 0:test-4g:12625051: type=AUTH_METHOD, val=PRESHARED_KEY.
ike 0:test-4g:12625051: type=OAKLEY_GROUP, val=MODP1536.
ike 0:test-4g:12625051: ISAKMP SA lifetime=3600
ike 0:test-4g:12625051: out 53B3A340214E0B8A469F4FFB9008EAD704100200000000000000011C0A0000C43E07BA29DAC1D85733595493CE03CE66741DC5CA56B5AD4051A7EEB16AC66BE2CE7B7CD92C4E1103F4FE5264342F06D455EF24CAAFBD04C65400AF933ABB1A7F33E980552F89C085DF937114A0FFCAE7A31A1F264A7AEDCEE4229D8516B743B8F3294D21490392483F8BC1435BD37E84E9643A81B63D526BD5A93A3AAD52911B8DFDCAAFEF207F174585761B6C10917ECB91E5D9D926CBBBA7C58CD8B6090ED5BBF01A808DB56B9D8A38657B490677E3C62F73BE1E05CF3C95D9FA6F49E9E48D1400001493D416F64EE16E6741AA3C977B08171D14000014438B058F4A819D574311D88CACFF4A86000000140E8B492978026BFDDCF931924B643F20
ike 0:test-4g:12625051: sent IKE msg (ident_i2send): X.X.X.X:500->X.X.X.X:500, len=284, id=53b3a340214e0b8a/469f4ffb9008ead7
ike 0: comes X.X.X.X:500->X.X.X.X:500,ifindex=351....
ike 0: IKEv1 exchange=Identity Protection id=53b3a340214e0b8a/469f4ffb9008ead7 len=300
ike 0: in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
ike 0:test-4g:12625051: initiator: main mode get 2nd response...
ike 0:test-4g:12625051: received NAT-D payload type 20
ike 0:test-4g:12625051: received NAT-D payload type 20
ike 0:test-4g:12625051: NAT detected: ME
ike 0:test-4g:12625051: NAT-T float port 4500
ike 0:test-4g:12625051: ISAKMP SA 53b3a340214e0b8a/469f4ffb9008ead7 key 32:3791683A25E8CBBE68F7897BFCB2D8D2EE0AFF5C477155B14F43CDD1459E9389
ike 0:test-4g:12625051: add INITIAL-CONTACT
ike 0:test-4g:12625051: enc 53B3A340214E0B8A469F4FFB9008EAD70510020100000000000000580800000C010000000A0A67190B000014F33BBB6DD35A229E689EE7892C7F4BA20000001C000000010110600253B3A340214E0B8A469F4FFB9008EAD7
ike 0:test-4g:12625051: out 53B3A340214E0B8A469F4FFB9008EAD705100201000000000000005CB84737AFDC8BADE434703EC4AF6E2430B6C55F468EBD00374AF52F1B8DDB24F1AC1C78153C1DE1464B24DFD2C416BCE76487F269802E424D52C0A64B838F90FD
ike 0:test-4g:12625051: sent IKE msg (ident_i3send): X.X.X.X:4500->X.X.X.X:4500, len=92, id=53b3a340214e0b8a/469f4ffb9008ead7
ike 0: comes X.X.X.X:4500->X.X.X.X:4500,ifindex=351....
ike 0: IKEv1 exchange=Informational id=53b3a340214e0b8a/469f4ffb9008ead7:30dbcd0a len=92
ike 0: in 53B3A340214E0B8A469F4FFB9008EAD70810050130DBCD0A0000005C0C4C10607A36BA5C75B7A0FBA7E76C6718D5F094670F90FA58F0EF5D5D9206B63DEA1558999E53A13E5E1B61D047BAB63423D57E2AAD2F51A78F18F51BE00F62
ike 0:test-4g:12625051: dec 53B3A340214E0B8A469F4FFB9008EAD70810050130DBCD0A0000005C0B000014D0AFEB1284628867BDA3911F323A199A0000001C000000010110001853B3A340214E0B8A469F4FFB9008EAD700000000000000000000000000000000
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:500 negotiating
ike 0:test-4g:12625051:test-4g:369935774: ISAKMP SA still negotiating, queuing quick-mode request
ike 0:test-4g:12625051: out 53B3A340214E0B8A469F4FFB9008EAD705100201000000000000005CB84737AFDC8BADE434703EC4AF6E2430B6C55F468EBD00374AF52F1B8DDB24F1AC1C78153C1DE1464B24DFD2C416BCE76487F269802E424D52C0A64B838F90FD
ike 0:test-4g:12625051: sent IKE msg (P1_RETRANSMIT): X.X.X.X:4500->X.X.X.X:4500, len=92, id=53b3a340214e0b8a/469f4ffb9008ead7
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g: request is on the queue
ike 0:test-4g:12625051: out 53B3A340214E0B8A469F4FFB9008EAD705100201000000000000005CB84737AFDC8BADE434703EC4AF6E2430B6C55F468EBD00374AF52F1B8DDB24F1AC1C78153C1DE1464B24DFD2C416BCE76487F269802E424D52C0A64B838F90FD
ike 0:test-4g:12625051: sent IKE msg (P1_RETRANSMIT): X.X.X.X:4500->X.X.X.X:4500, len=92, id=53b3a340214e0b8a/469f4ffb9008ead7
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g: request is on the queue
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g: request is on the queue
ike 0:test-4g:12625051: out 53B3A340214E0B8A469F4FFB9008EAD705100201000000000000005CB84737AFDC8BADE434703EC4AF6E2430B6C55F468EBD00374AF52F1B8DDB24F1AC1C78153C1DE1464B24DFD2C416BCE76487F269802E424D52C0A64B838F90FD
ike 0:test-4g:12625051: sent IKE msg (P1_RETRANSMIT): X.X.X.X:4500->X.X.X.X:4500, len=92, id=53b3a340214e0b8a/469f4ffb9008ead7
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g: request is on the queue
ike 0:test-4g:test-4g: IPsec SA connect 351 X.X.X.X->X.X.X.X:0
ike 0:test-4g:test-4g: using existing connection
ike 0:test-4g:test-4g: config found
ike 0:test-4g: request is on the queue
ike 0:test-4g:12625051: negotiation timeout, deleting
ike 0:test-4g: connection expiring due to phase1 down
ike 0:test-4g: deleting
ike 0:test-4g: deleted

 

2 replies

sw2090
SuperUser
sw2090
SuperUser
May 3, 2022

accoarding to your log: it starts phase1 and it does negotiate proposals,DPD and NAT-T and due to NAT-T it then starts using Port 4500 (correct). However it does not get any more responses then to finish phase1 negotiation. It does retransmit the last message several times but gets no answer from your tplink and finally gives up saying "negotiation timeout".

 

Is there something between FGT and the TP-Link which the traffic has to pass? Then you will have to forwart 500/udp and 4500/udp to the tplink to solve that.

Also you could check the logs on the tplink to see if or why it doesn't repsond to your FGT anymore.

pierrec
pierrecAuthor
New Member
May 3, 2022

Thank you for the answer, using fortianalyzer, I can see the messages coming from the TP-link on port 4500 and it seems that the fortigate is responding. Maybe the firewall is not having what it is looking for in the response from the TP-Link ?

I'll open a thread on the TP-Link forum the seak further explanations

sw2090
SuperUser
sw2090
SuperUser
May 3, 2022

either that or the answer comin from the FortiGate does - for whatever reason - not reach the tp-link. You might see that in some log on the tplink.

pierrec
pierrecAuthor
New Member
May 3, 2022

unfortunatly, there is no log on the TP-Link regarding IPSEC.

I see both devices communicating on both port 500 and 4500.

The firmware I'm using on the TP-Link to activate the VPN IPSEC feature is a beta firmware. I'm asking TP-Link if there is an update or another firmware that I could try.

Lucascat68
Lucascat68
New Member
July 7, 2022

Hi, I have the same problem with a MR400. Have solved in some way?

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