Hello, everyone!
Today, I'd like to share a case with you.
Product Model: SmartAX MA5600T
Problem Description
After IPv4/IPv6 is configured on the WAN interface on the EG8141A5, the EG8141A5 still fails to obtain an IPv6 address from the DHCPv6 server.
Problem Analysis
1. Capture packets and gather information for analysis.
To collect information, perform the following steps:
（Capture packets on the ONT to reproduce the problem.）
Telnet to the ONT through the LAN port, and then run the following command to configure port mirroring for the ONT LAN port. (The following example mirrors PON port (10) to LAN port 1.)
WAP> set ethportmirror sourceport 10 destport 1 mirrordate 2 enable 1
Connect the PC to the destination LAN port and start a Wireshark capture.
Redial the PPPOE account and reproduce the issue.
After the issue recurs, copy, save and share the captured file.
Delete the mirroring configuration.
WAP> set ethportmirror sourceport 10 destport 1 mirrordate 2 enable 0
2. Collect the ONT fault information ：
WAP> collect debug info //wait about 5 minutes
Or collect the following information from the ONT web page:
3. Collect ONT configurations.
The log and configuration file shows that the IPv6 address obtaining mode is auto and the IPv6 prefix obtaining mode is PD. The GLA address is obtained during the dial-up and PPP phase. It should then obtain the GUA address through RS/RA packet exchange DHCP6C. However, the ONT sends an RS message, but the upper-layer server does not reply with an RA message. As a result, the ONT cannot obtain an IPv6 address.
Root Cause
The EG8141A5 sends an RS message but the upper-layer server does not reply with an RA message. This indicates that DHCP6C is not started. Therefore, the EG8141A5 cannot obtain an IPv6 address.
Solution Description
Start the upper-layer DHCP6C server.
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