But before doing that, you have to change the LSB of the byte at offset 19 (0x13) to 0 to indicate that the packet contents is not encrypted. Instead of copying the decryption key from Mikrotik's log, you copy the decrypted received packet bytes, reformat them to form up a hexdump text, and import that hexdump to Wireshark. There is an alternative way to visualise ISAKMP messages in Wireshark which handles any encryption algorithm because it uses Mikrotik's own decryption.
l?id=36879įurther Information regarding Wireshark & Decryption. 63#p576563įor the XAUTH-Issue you can find furthe details here. The root-cause is known: my password is 4 digits long but android sends a 5 digit password -> for a fix, see. Why did I do all of this? My Android tablet using IPSec-Xauth-PSK can not authenticate:ġ5:03:36 ipsec,debug Attribute XAUTH_USER_NAME len 4ġ5:03:36 ipsec,debug Attribute XAUTH_USER_PASSWORD len 5ġ5:03:36 ipsec,info Xauth login failed for user: test Step 12: Click on and add the Cookie and Encryption key without blanks inbetween, trailing or leading Step 11: Right-Click on an ISAKMP-Packet -> Protocol Settings -> IKEv1 Decryption Table Step 10: Open your Dump file "isakmp.pcap" in Wireshark (I used the latest version 2.2.3) Step 9: Search for Encryption Key (here my example)ġ5:03:36 ipsec,debug final encryption key computed:ġ5:03:36 ipsec,debug fc9c635a a7a316d3 7442463e d2e581ea 1263b66b 94ada5ec Now the tricky part, find the Decryption Variables which we need for Wireshark Step 7: Open log.txt with proper Text-Editor (e.g. Step 6: Download "isakmp.pcap" and "log.txt" from Files Step 5: Copy Mikrotik-Log to a file: /log print file=log
Step 4: Start Packet-Sniffer, Start establishing IPSec-Tunnel, Stop Sniffer
Step 3: Configure the Packet Sniffer to capture "UDP 500", Output-File: "isakmp.pcap" Step 2: Set your IPSec-Tunnel to use 3DES encryption (only 3DES can be decrypted by Wireshark) Step 1: enable IPSec Logging (System -> Logging -> IPSec to Memory)
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