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IPv6 autoconfg no default gateway

Hi,

ASG120
Firmware: 9.106-17

from time to time my IPv6 connection isn't working. I get native IPv6 support from my provider with a /48 prefix that I divide into different nets, but that's a different topic.

What happens when I provide public IPs to my computers on my linux client this is my default route:
::/0                           ::                         !n   -1  1  2831 lo
which of course don't lead me into the IPv6 Internet. Some other times I actually get a link local gateway for ::/0 but so far I was not able to reproduce, when.

Currently I deactivated the advertisment of the ULA prefix on the same net because I thought this could be the cause, but it obviously isn't.

Could someone please lead me into the correct direction?!

Thank you!

#

# radvd configuration generated by radvdump 1.9.1
# based on Router Advertisement from fe80::2ea:8a:fe12:9108
# received by interface brlan
#

interface brlan
{
AdvSendAdvert on;
# Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
AdvManagedFlag off;
AdvOtherConfigFlag on;
AdvReachableTime 0;
AdvRetransTimer 0;
AdvCurHopLimit 64;
AdvDefaultLifetime 1800;
AdvHomeAgentFlag off;
AdvDefaultPreference high;
AdvSourceLLAddress on;

prefix 2a42:fa0:22:10::/64
{
AdvValidLifetime 2592000;
AdvPreferredLifetime 604800;
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr off;
}; # End of prefix definition


RDNSS 2a42:fa0:22:10::1
{
AdvRDNSSLifetime 600;
}; # End of RDNSS definition


RDNSS 2a42:fa0:22:10::8:107
{
AdvRDNSSLifetime 600;
}; # End of RDNSS definition


DNSSL myverypersonalcompany.lan
{
AdvDNSSLLifetime 600;
}; # End of DNSSL definition

}; # End of interface definition


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