What should I do when my Internet access dial-up connection fails?
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VX220-G2v , VX420-G2h , Archer VR1600v , VX4440-G2h , TD-W8961N , VX221-G3v
Recent updates may have expanded access to feature(s) discussed in this FAQ. Visit your product's support page, select the correct hardware version for your device and check either the Datasheet or the firmware section for the latest improvements added to your product.
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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