FAQ
Answers to frequently asked questions about IPv6 Gateway.
Why does a ping to an IPv6 network fail when the data packet exceeds 1,500 bytes?
During data transmission, the maximum transmission unit (MTU) limits the maximum size of a data packet. For example, the MTU of Ethernet is 1,500 bytes. If the IP layer needs to transmit a data packet that exceeds the MTU, it fragments the data packet so that each fragment is no larger than the MTU. Frequent fragmentation reduces network transmission efficiency.
In IPv6 networks, routers do not fragment data packets, which simplifies packet processing and improves processing efficiency. Fragmentation is performed by the IP layer of the source host only when required. If a data packet on the transmission path exceeds the MTU, the router drops the data packet and returns a Packet Too Big message to the source host. The IP layer of the source host then fragments the data packet and retransmits it. However, a ping to an IPv6 network fails when the transmitted data packet is larger than 1,500 bytes. To test the connectivity of the IPv6 network, use a data packet that does not exceed 1,500 bytes.
How does a backend server that uses an IPv4 address provide services to IPv6 clients?
You can use Global Accelerator (GA) to enable IPv6 translation service, which allows IPv6 clients to access backend IPv4 services. For more information, see Enable IPv4 services to support IPv6 clients.
Can I change the billing method of IPv6 Internet bandwidth?
No. You cannot directly change the billing method of IPv6 Internet bandwidth.
However, you can switch to the pay-by-data-transfer billing method by deleting the Internet bandwidth and enabling it again:
Delete the Internet bandwidth that uses the pay-by-bandwidth billing method.
Enable Internet bandwidth again and select pay-by-data-transfer as the billing method.
The IPv6 address remains unchanged.
Can IPv6 Gateway resources in the current account be transferred to another Alibaba Cloud account?
Currently, neither IPv6 Gateways nor IPv6 addresses can be transferred to another Alibaba Cloud account. To migrate these resources, release the IPv6 Gateway in the source account, and then create and purchase a new IPv6 Gateway in the destination account. The new IPv6 Gateway uses different IPv6 addresses.