What should I do when my Internet access dial-up connection fails?
Note: This Article Applies to Dialing failure caused by physical layer connection and Dialing failure caused by internet access problems
Module I. Physical layer connection
Part 1. Physical layer interface check
- Check the Internet corresponding interface indicator light connection
PON(GPON/EPON) LED:
Light Flash to On |
The router is registered with the OLT |
DSL(ADSL/VDSL) LED:
Light Flash to On |
DSL synchronization is complete. |
WAN LED:
Light On |
Powered device is connected to the associated port but no traffic |
Part 2. Web page information check
- Check the connection state for the web page
Part 3. The debug information of the serial port
Module II. Dial-up connection
Part 1. IPv4
- PPPoE
• Check the settings of PPPoE dial-up
• Username/password
• Host unique
• MTU value: The size of the package when it is forwarded, and when that value is exceeded, it needs to be sliced
• The interaction process of PPPoE dial-up
- PPTP
• The second connection (usually dynamic or static) can dial the number, and the first connection cannot dial the number
• PPTP Server Address is not correct
• Problems with double - connection applications
The First Connection information and corresponding interactive packages:
The Second Connection information and corresponding interactive packages:
- L2TP
• The second connection (usually dynamic or static) can dial the number, and the first connection cannot dial the number
• L2TP Server Address is not correct
• Problems with double - connection applications
The First Connection information and corresponding interactive packages:
The Second Connection information and corresponding interactive packages:
- DHCP
• DHCP server dial-up interactive process
• Check the IP Address, DNS, Gateway when dial-up successfully
• Grab the packages of dial-up process
Part 2. IPv6
- PPPoE and SLAAC
• Verify that the PPPoE username password is incorrect
• IPv4 has address while IPv6 has no address
Step1: Grab packages to check the PPPoE dial-up status
Step2: Grab packages to check the SLAAC dial-up status
*RS represents the Router Solicitation message. RA messages represent the Router Advertisement.
*When grabbing the PPPoE packages, the filter condition is set to ppp || pppoed
*When grabbing the SLAAC packages, the filter condition is set to dhcpv6 || icmpv6
- DHCP and SLAAC
• To check whether IPv4 has address but IPv6 has no address
• To check whether wan has IPv6 address but the LAN has no IPv6 address
Step1: Grab packages to check the DHCP dial-up status
Step2: Grab packages to check the SLAAC dial-up status
*When grabbing the DHCP packages, the filter condition is set to bootp
* When grabbing the SLAAC packages, the filter condition is set to dhcpv6 || icmpv6
- PPPoE and DHCPv6
• Verify that the PPPoE username password is incorrect
• To check whether IPv6 has no address or not
Step1: Check the DHCPv6 messages
Step2: INA is the wan address of the router and PD is the prefix of the lan port device
Step3: Grab packages to check the PPPoE dial-up status
Step4: Grab packages to check the DHCPv6 dial-up status
*When grabbing the PPPoE packages, the filter condition is set to ppp || pppoed
*When grabbing the DHCPv6 packages, the filter condition is set to dhcpv6
- DHCP and DHCPv6
• To check whether IPv4 has address but IPv6 has no address
• To check whether IPv6 has no address or not
Step1: Grab packages between lan and wan port to check the packages of DHCP and ICMPv6 (RS RA)
Step2: Grab packages to check the DHCP dial-up status
Step3: Grab packages to check the DHCPv6 dial-up status
- PD Only
Step1: Special dialing requirements for Russia and Brazil
Step2: To check whether the software version supports the dial mode or not
Step3: To check the PD fields of the DHCPv6 message between the DUT and server
Step4: PD detail information
Note : The PD fields represent the Prefix Delegation
Part 2. IPv6 Only
- SLAAC
• Check to see if the ICMPv6 RS/RA message between DUT and Server is working
- DHCPv6
• Check whether the IANA, DNS and PD fields in the message are normal
• Check the IANA/IAPD information:
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