VPN solution with USG20-VPN and Fritzbox

kawer83 · January 5

Thanks a lot @PeterUK , that works perfect. I also added the Key groups DH14 and DH19 groups in Phase 1 to enable VPN from iOS. With DH2 it did not work for me.

As I now have a more secure feeling I would like to ask if anybody of you worries about the connections attempts in the monitor logs from other countries? Since the VPN gateway is enabled I see connection attempts in the logs like this which is definetly not mine. Is that anything I have to worry about?

PeterUK · January 5

Exposing any port is a risk but if your patched it fine.

If you want to up the security you can have your clients run DDNS and on your side allow from source them FQDN to Zywall works really well.

kawer83 · January 8

Hi @Zyxel_James ,

thanks for your answer and the instruction link. I checked it and it works to get the configuration from the server, but no connection can be established. Here is what the IKE logs says:

6	2024-01-04 10:38:04	info	IKE	IKE SA [VPN_Home] is disconnected	192.168.10.153:500	80.187.120.128:500	IKE_LOG
7	2024-01-04 10:38:04	info	IKE	The cookie pair is : 0x8fa5b15cd3cbf7bd / 0x187b653fb168338d	192.168.10.153:500	80.187.120.128:500	IKE_LOG
16	2024-01-04 10:37:46	info	IKE	IKE SA [VPN_Home] is disconnected	192.168.10.153:500	80.187.120.128:500	IKE_LOG
17	2024-01-04 10:37:46	info	IKE	The cookie pair is : 0xdb227cc9faba3f7d / 0x2bd4af28c484e1fc	192.168.10.153:500	80.187.120.128:500	IKE_LOG
19	2024-01-04 10:37:32	info	IKE	IPsec SA negotiation failed	192.168.10.153:500	80.187.120.128:500	IKE_LOG
20	2024-01-04 10:37:32	info	IKE	[AUTH] Recv:[IDi][AUTH][SA][TSi][TSr][NOTIFY][NOTIFY]	80.187.120.128:4500	192.168.10.153:4500	IKE_LOG
21	2024-01-04 10:37:32	info	IKE	The cookie pair is : 0x187b653fb168338d / 0x8fa5b15cd3cbf7bd	80.187.120.128:4500	192.168.10.153:4500	IKE_LOG
22	2024-01-04 10:37:32	info	IKE	[INIT] Send:[SAr1][KE][NONCE][NOTIFY][NOTIFY][NOTIFY][CERTREQ][VID][VID][VID][VID][VID][VID]	192.168.10.153:500	80.187.120.128:500	IKE_LOG
23	2024-01-04 10:37:32	info	IKE	The cookie pair is : 0x8fa5b15cd3cbf7bd / 0x187b653fb168338d [count=2]	192.168.10.153:500	80.187.120.128:500	IKE_LOG
24	2024-01-04 10:37:32	info	IKE	Recv IKE sa: SA([0] protocol = IKE (1), spi_len = 8, spi = 0x8fa5b15c d3cbf7bd, AES CBC key len = 256, HMAC-SHA256 PRF, HMAC-SHA256-128, 521 bit ECP, 384 bit ECP, 256 bit ECP, 8192 bit MODP, 6144 bit MODP, 4096 bit MODP, 3072 bit MODP, 2048 bit MODP, 1536	80.187.120.128:500	192.168.10.153:500	IKE_LOG
25	2024-01-04 10:37:32	info	IKE	The cookie pair is : 0x187b653fb168338d / 0x8fa5b15cd3cbf7bd [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
26	2024-01-04 10:37:32	info	IKE	IKE SA [VPN_Home] is disconnected	192.168.10.153:500	80.187.120.128:500	IKE_LOG
27	2024-01-04 10:37:32	info	IKE	The cookie pair is : 0x23ab84b2fe0eacf7 / 0xdaf4ccf9d50fc3f1	192.168.10.153:500	80.187.120.128:500	IKE_LOG
28	2024-01-04 10:37:32	info	IKE	Recv IKE sa: SA([0] protocol = IKE (1), AES CBC key len = 256, HMAC-SHA256 PRF, HMAC-SHA256-128, 521 bit ECP, 384 bit ECP, 256 bit ECP, 8192 bit MODP, 6144 bit MODP, 4096 bit MODP, 3072 bit MODP, 2048 bit MODP, 1536 bit MODP, 1024 bit MODP, 768 bit MODP;	80.187.120.128:500	192.168.10.153:500	IKE_LOG
29	2024-01-04 10:37:32	info	IKE	[INIT] Recv: [SA][NONCE][NOTIFY][NOTIFY][KE][VID] [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
30	2024-01-04 10:37:32	info	IKE	Receiving IKEv2 request [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
31	2024-01-04 10:37:32	info	IKE	The cookie pair is : 0xdaf4ccf9d50fc3f1 / 0x23ab84b2fe0eacf7 [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
33	2024-01-04 10:37:14	info	IKE	IPsec SA negotiation failed	192.168.10.153:500	80.187.120.128:500	IKE_LOG
34	2024-01-04 10:37:14	info	IKE	[AUTH] Recv:[IDi][AUTH][SA][TSi][TSr][NOTIFY][NOTIFY]	80.187.120.128:4500	192.168.10.153:4500	IKE_LOG
35	2024-01-04 10:37:14	info	IKE	The cookie pair is : 0x2bd4af28c484e1fc / 0xdb227cc9faba3f7d	80.187.120.128:4500	192.168.10.153:4500	IKE_LOG
36	2024-01-04 10:37:14	info	IKE	[INIT] Send:[SAr1][KE][NONCE][NOTIFY][NOTIFY][NOTIFY][CERTREQ][VID][VID][VID][VID][VID][VID]	192.168.10.153:500	80.187.120.128:500	IKE_LOG
37	2024-01-04 10:37:14	info	IKE	The cookie pair is : 0xdb227cc9faba3f7d / 0x2bd4af28c484e1fc [count=2]	192.168.10.153:500	80.187.120.128:500	IKE_LOG
38	2024-01-04 10:37:13	info	IKE	Recv IKE sa: SA([0] protocol = IKE (1), spi_len = 8, spi = 0xdb227cc9 faba3f7d, AES CBC key len = 256, HMAC-SHA256 PRF, HMAC-SHA256-128, 521 bit ECP, 384 bit ECP, 256 bit ECP, 8192 bit MODP, 6144 bit MODP, 4096 bit MODP, 3072 bit MODP, 2048 bit MODP, 1536	80.187.120.128:500	192.168.10.153:500	IKE_LOG
39	2024-01-04 10:37:13	info	IKE	The cookie pair is : 0x2bd4af28c484e1fc / 0xdb227cc9faba3f7d [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
40	2024-01-04 10:37:13	info	IKE	IKE SA [VPN_Home] is disconnected	192.168.10.153:500	80.187.120.128:500	IKE_LOG
41	2024-01-04 10:37:13	info	IKE	The cookie pair is : 0x2c1cf186d4a913f5 / 0x7223966460b10d98	192.168.10.153:500	80.187.120.128:500	IKE_LOG
42	2024-01-04 10:37:13	info	IKE	Recv IKE sa: SA([0] protocol = IKE (1), AES CBC key len = 256, HMAC-SHA256 PRF, HMAC-SHA256-128, 521 bit ECP, 384 bit ECP, 256 bit ECP, 8192 bit MODP, 6144 bit MODP, 4096 bit MODP, 3072 bit MODP, 2048 bit MODP, 1536 bit MODP, 1024 bit MODP, 768 bit MODP;	80.187.120.128:500	192.168.10.153:500	IKE_LOG
43	2024-01-04 10:37:13	info	IKE	[INIT] Recv: [SA][NONCE][NOTIFY][NOTIFY][KE][VID] [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
44	2024-01-04 10:37:13	info	IKE	Receiving IKEv2 request [count=2]	80.187.120.128:500	192.168.10.153:500	IKE_LOG
45	2024-01-04 10:37:13	info	IKE	The cookie pair is : 0x7223966460b10d98 / 0x2c1cf186d4a913f5 [count=2]	80.187.120.128:500	192.168.10.153:500

kawer83 · January 8

6	2024-01-04 10:38:04	info	IKE	IKE SA [VPN_Home] is disconnected	192.168.10.153:500	80.187.120.128:500	IKE_LOG

mm_bret · January 8

PeterUK game some good insider stuff for modifying the encryption on the Windows client.

Here's some steps for a Windows 10 vpn client.

L2TP-Windows 10

Click Windows Start Icon
Click Settings Gear on left of popup window
Click Network and Internet
Click VPN on left panel
Click [+] Add a VPN Connection
VPN Provider
-Select Built in (from list)
-Connection Name enter: name your l2tp connection-Server Name or Address enter: (ip of USG router)
-VPN Type: L2TP/IPSEC with preshared key
(When selected Preshared key text box will appear)
-Preshared key enter: (enter the pre-shared key you created on your usg router l2tp gateway)-Type of sign-in info: User name and password
-User name enter: (name of user created on the USG /Object User)
-Password enter: (password of user created on the USG /Object User)
Save Connection

Sounds like you have this solved, just adding to the pot.

VPN solution with USG20-VPN and Fritzbox

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