IPv6 Martians

[Hrant Dadivanyan]

On 8/29/18 12:01 AM, Eugene Grosbein wrote:
> 29.08.2018 2:35, Dries Michiels wrote:
> 
>>> IPv6 Martians are blocked by forwarding code in 11-STABLE, but all this noise
>>> fills kernel message buffer:
>>>
>>> cannot forward from :: to 2001:xyz:zxy::f00b nxt 58 received on vlan5 cannot
>>> forward from :: to 2001:xyz:zxy::f00b nxt 58 received on vlan5 cannot
>>> forward from :: to 2001:xyz:zxy::f00b nxt 58 received on vlan5 cannot
>>> forward src fe80:10::yxz:a50f:fcb6:5f1e, dst 2001:xyz:zxy::f00b, nxt 58, rcvif
>>> vlan4, outif vlan2 cannot forward src fe80:10::yxz:a50f:fcb6:5f1e, dst
>>> 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::yxz:a50f:fc89:e1a0, dst 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif
>>> vlan2 cannot forward src fe80:10::yxz:a50f:fc89:e1a0, dst
>>> 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::268a:7ff:feeb:d250, dst 2001:xyz:zxy::d1, nxt 17, rcvif vlan4, outif
>>> vlan2 cannot forward src fe80:10::yxz:a50f:fc8a:9024, dst
>>> 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::yxz:a50f:fc8a:9024, dst 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif
>>> vlan2 cannot forward src fe80:10::1, dst 2001:xyz:zxy::f00b, nxt 58, rcvif
>>> vlan4, outif vlan4 cannot forward src fe80:10::1, dst 2001:xyz:zxy::f00b, nxt
>>> 58, rcvif vlan4, outif vlan4 cannot forward src fe80:10::250:56ff:fe86:1b36,
>>> dst 2001:xyz:zxy::d1, nxt 17, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::yxz:a50f:fc90:9d4, dst 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif
>>> vlan2 cannot forward src fe80:10::yxz:a50f:fc90:9d4, dst 2001:xyz:zxy::f00b,
>>> nxt 58, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::yxz:a50f:fc89:e1a0, dst 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif
>>> vlan2 cannot forward src fe80:10::yxz:a50f:fc89:e1a0, dst
>>> 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif vlan2 cannot forward src
>>> fe80:10::yxz:a50f:fc89:e1a0, dst 2001:xyz:zxy::f00b, nxt 58, rcvif vlan4, outif
>>> vlan2
>>>
>>> Dear subscribes, could you please prompt how to get rid of this noise?
>>> So far I have not found appropriate sysctl for disabling this messages.
>>
>> I can confirm the same issue on stable-11. 
>> I just ignored it as I thought it was a badly coded client.
>> Seems there is something else going on then.
> 
> As workaround, use sysctl net.inet6.ip6.log_interval=2147483647
> This means "log this once per 68 years".
> 

Block these in firewall, as another workaround.

> 
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