> ## Documentation Index
> Fetch the complete documentation index at: https://docs.edisglobal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# IPv6 Troubleshooting

> Troubleshoot IPv6 connectivity on a VPS by checking for typos in addresses, subnet masks, and default routes, and verifying routing on the network interface.

## Basic IPv6 troubleshooting

When **troubleshooting in the IPv6 area,** it is particularly important to double-check the IP address, subnet mask, and the default route or default gateway for typos. Due to the nature (length and complexity) of IPv6 addresses, it is easily possible to miss or accidentally add a digit.

In Debian Linux you can work with the following commands:

`ip -6 addr show` - display configured IPv6 address

`ip -6 route show` - display configured default route

### Examples

Examples based on an IP address configured in Austria, at the interface eth0

```shell theme={"system"}
ip -6 addr show

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000 inet6 2a03:f80:ed15:435a::1/48 scope global

```

<Note>
  Please pay attention to use the correct subnet (*2a03:f80:xx:xxxx::1*) and
  netmask /48
</Note>

```shell theme={"system"}
ip -6 route show

default via 2a03:f80:ed15::1 dev eth0

```

<Note>
  Please pay attention to use the correct default gateway (2a03:f80:xxx::1)
  Every server location has its own unique gateway address!
</Note>

If the configuration seems correct and IPv6 is still not working properly, this could be a general network issue. A test with **mtr** or **ping** provides more insights.

Use an address that you can assume will work with a high degree of probability, such as ipv6.google.com:

`mtr -6 -r ipv6.google.com`

`ping -6 ipv6.google.com`