Fault Description

A user fails to obtain the IP address. In such a case, check the packet statistics. It is found that only the DHCP discover packets from the user are received, but the DHCP offer packets from the DHCP server are not received. In addition, no packet is received on the BRAS.

Alarm Information

None

Cause

The configuration on the OLT is improper.

Procedure

• Check the link between user and OLT. It is found that the link is in the normal state.
• Check the link between the OLT and the BRAS. It is found that the link is in the normal state.
• Check the system configuration. It is found that the user VLAN is not bound to the DHCP server.
• Bind the DHCP server. It is found that the user obtain the IP address and successful access the Internet.

Suggestion and Conclusion

In this case, the operator once performed an operation for deleting the Layer 3 interface. After a new Layer 3 interface is created, it is not bound to the DHCP server, which results in the loss of the configuration. In practice, the majority of the faults relating to DHCP occur on the OLT. Therefore, when finding such a fault, check the configuration of the OLT first.

cool

Good read.

Thanks for sharing

Useful information!
Thanks for sharing.

There are many case for user cannot connect internet, this is one case normal,

Helpful.....

thanks for this information its really helpful .......