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Troubleshooting IP-EXT16 Network Connection Issues with Various Cases and Protocol Analysis

This document outlines the troubleshooting process for the IP-EXT16 device connection issues in relation to the KX-PT, KX-TDA0470, and PC interfaces. It covers multiple cases illustrating communication failures due to physical disconnection, incorrect IP address settings, unregistered device status, and protocol failures (ARP, PTAP, ICMP, and MGCP). Each case provides detailed technical insights, such as error messages like “POOR LAN CONNECTION” and “UNREGISTERED SERVER”, as well as the necessary actions to diagnose and resolve these network failures.

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Troubleshooting IP-EXT16 Network Connection Issues with Various Cases and Protocol Analysis

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  1. Communication between IP-EXT16 & IP-PT

  2. General configuration Default gateway: 192.168.1.1 L2 SW-Hub Repeater-Hub IP-EXT16 Monitor by Ethereal KX-TDA0470 KX-NT136 PC 192.168.1.100 192.168.1.200 192.168.1.10

  3. Case-1a (1/4) IP-EXT16 was not connected to the network. Physical disconnection IP-EXT16 KX-TDA0470 KX-NT136 PC

  4. Case-1a (2/4) Power-ON IPL Starting... KX-NT136 Now Loading Searching... 20-30 sec POOR LAN CONNECTION keep retrying

  5. Case-1a (3/4) ARP request MAC Address of IP-PT Protocol: ARP Source : KyushuMa_30:2f:80 Destination : Broadcast IP Address of IP-EXT Info: Who has 192.168.1.100? Tell 192.168.1.200 IP Address of IP-PT

  6. Case-1a (4/4) (1) ARP(Address Resolution Protocol) was sent by IP-PT for finding the MAC address of IP-EXT. (2) But no response came from IP-EXT because it has physical connection problem. (3) After the several trial of ARP, IP-PT displayed “POOR LAN CONNECTION”.

  7. Case-1b (1/6) IP address of IP-EXT16 was wrong at IP-PT setting. 192.168.1.100 Connection Request 192.168.1.10 is address of PC. IP-EXT16 KX-TDA0470 KX-NT136 PC Setup as PBX = 192.168.1.10

  8. Case-1b (2/6) Power-ON IPL Starting... KX-NT136 Now Loading Searching... Searching…. 40 sec POOR LAN CONNECTION keep retrying

  9. Case-1b (3/6) ARP response MAC Address of PC Protocol: ARP Source : Matsushi_2b:df:c3 MAC Address of IP-PT Destination : KyushuMa_30:2f:80 Info: 192.168.1.10 is at 00:80:45:2b:df:c3 MAC Address of PC

  10. Case-1b (4/6) PTAP connection request Protocol: UDP IP Address of IP-PT Because PTAP is not the common protocol, it is displayed as UDP and unknown binary data. Source : 192.168.1.200 Destination : 192.168.1.10 PTAP Port of IP-PT IP Address of PC Info: Source port 9301 Destination port 9300 PTAP Port of IP-EXT

  11. Case-1b (5/6) ICMP destination unreachable Protocol: ICMP IP Address of PC Source : 192.168.1.10 Destination : 192.168.1.200 Info: Destination unreachable IP Address of IP-PT

  12. Case-1b (6/6) (1) ARP(Address Resolution Protocol) was sent by IP-PT for finding the MAC address of IP-EXT. (2) ARP was resolved by the answer from PC(wrong). (3) IP-PT sent PTAP(connection request) to PC(wrong). (4) Because PC can not respond the packet to port 9300, PC responded by ICMP to reject the packet from IP-PT. (5) Because the connection ACK by PTAP was not presented, “POOR LAN CONNECTION” was displayed .

  13. Case-2 (1/5) In the Normal mode of IP-EXT16, unregistered IP-PT was started. Connection Request NAK IP-EXT16 KX-TDA0470 KX-NT136 PC

  14. Case-3 (2/5) Power-ON IPL Starting... KX-NT136 Now Loading Searching... Searching…. UNREGISTERED SERVER keep retrying

  15. Case-2 (3/5) PTAP connection request Protocol: UDP IP Address of IP-PT PTAP Port of IP-PT Source : 192.168.1.200 Destination : 192.168.1.100 Info: Source port 9301 Destination port 9300 PTAP Port of IP-EXT IP Address of IP-EXT

  16. Case-2 (4/5) PTAP NAK Protocol: UDP IP Address of IP-EXT PTAP Port of IP-EXT Source : 192.168.1.100 Destination : 192.168.1.200 Info: Source port 9300 Destination port 9301 IP Address of IP-PT PTAP Port of IP-PT In case of NAK, the data size of PTAP response from IP-EXT is small.

  17. Case-2 (5/5) (1) ARP(Address Resolution Protocol) was sent by IP-PT for finding the MAC address of IP-EXT. (2) ARP was resolved by the answer from IP-EXT. (3) IP-PT sent PTAP(connection request) to IP-EXT. (4) Because IP-PT was not registered, IP-EXT in Normal mode responded by NAK. (5) Because the connection NAK by PTAP was presented, “UNREGISTERED SERVER” was displayed .

  18. Case-3 (1/7) In the Registration mode of IP-EXT16, unregistered IP-PT was started. Connection Request ACK IP-EXT16 KX-TDA0470 KX-NT136 PC

  19. Case-3 (2/7) Power-ON IPL Starting... KX-NT136 Now Loading Searching... Searching…. Server Connecting... ON-Line

  20. Case-3 (3/7) PTAP ACK Protocol: UDP IP Address of IP-EXT PTAP Port of IP-EXT Source : 192.168.1.100 Destination : 192.168.1.200 Info: Source port 9300 Destination port 9301 IP Address of IP-PT PTAP Port of IP-PT In case of ACK, the data size of PTAP response from IP-EXT is bigger.

  21. Case-3 (4/7) MGCP RSIP Protocol: MGCP IP Address of IP-PT Source : 192.168.1.200 Destination : 192.168.1.100 Info: RSIP (Restart In Progress) IP Address of IP-EXT Because MGCP is one of the common protocol, we can easily find it from the log. This message is reporting the fact to the IP-EXT that the IP-PT is restarting now.

  22. Case-3 (5/7) PTAP alive check Protocol: UDP IP Address of IP-PT PTAP Port of IP-PT Source : 192.168.1.200 Destination : 192.168.1.100 Info: Source port 9301 Destination port 9300 IP Address of IP-EXT PTAP Port of IP-EXT This message is the alive check message from IP-PT to IP-EXT.

  23. Case-3 (6/7) PTAP alive check response Protocol: UDP IP Address of IP-EXT PTAP Port of IP-EXT Source : 192.168.1.100 Destination : 192.168.1.200 Info: Source port 9300 Destination port 9301 IP Address of IP-PT PTAP Port of IP-PT This is the response message for alive check returned from IP-EXT to IP-PT.

  24. Case-3 (7/7) (1) ARP(Address Resolution Protocol) was sent by IP-PT for finding the MAC address of IP-EXT. (2) ARP was resolved by the answer from IP-EXT. (3) IP-PT sent PTAP(connection request) to IP-EXT. (4) Because IP-PT was not registered, IP-EXT in Registration mode responded by ACK as the sign of the registration completed. (5) Because the connection ACK by PTAP was presented, normal operation started at IP-PT.

  25. Case-4 (1/3) In the Normal mode of IP-EXT16, registered IP-PT was started. Connection Request ACK IP-EXT16 KX-TDA0470 KX-NT136 PC

  26. Case-4 (2/3) Power-ON IPL Starting... KX-NT136 Now Loading Searching... Searching…. Server Connecting... ON-Line

  27. Case-4 (3/3) (1) ARP(Address Resolution Protocol) was sent by IP-PT for finding the MAC address of IP-EXT. (2) ARP was resolved by the answer from IP-EXT. (3) IP-PT sent PTAP(connection request) to IP-EXT. (4) Because IP-PT was registered, IP-EXT in Normal mode responded by ACK. (5) Because the connection ACK by PTAP was presented, normal operation started at IP-PT.

  28. End

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