Fwd: IPv6 FIB frequent add/remove messages (dual-stack)

---------- Forwarded message ----------
From: Bernard Rosset <be.rosset@gmail.com>
Date: Thu, Dec 13, 2012 at 6:13 PM
Subject: Re: IPv6 FIB frequent add/remove messages (dual-stack)
To: Pascal Hambourg <pascal@plouf.fr.eu.org>

Thanks Philipp, Pascal for your answers.

I didn't even make the effort to think over the /128. And also about the network mask...
I feel stupid about that now :oP

No, I don't have much more details from my hoster. My contact is relaying information from their "network team", he doesn't seem to understand much more than me what he is talking about...
I don't know what to seek for with tcpdump, honestly.

The router I was talking about seems to be the device their log trace was taken from.
I do not handle routing of anything on the network, I just own a server over there.

I'll try to get information from their side.

---
B. R.

On Thu, Dec 13, 2012 at 5:04 PM, Pascal Hambourg <pascal@plouf.fr.eu.org> wrote:

Hello,

B.R. a écrit :

> Hi,
>
> I own a hosted dedicated server and my hosting provider just reported me my
> server is continuously removeing/adding entries to the FIB table of their
> router.

Did the provider bother to explain what they meant precisely by
removing/adding entries to the FIB table of their router" ?

> Here is the reported spam:
> Dec 12 19:43:02.567: [base] 2A00:C70:1:213:246:aaa:bbb:0/128'0A FIB remove

[...]

> Here is my interface configuration:

[...]

> iface eth0 inet6 static
> address 2a00:c70:1:213:246:aaa:bbb:0
> netmask 96
> gateway 2a00:c70:1:213:246:aaa::1
>
> The IPv6 configuration has been checked against the hoster guidelines and
> is correct.

Really ? With a /96 prefix length ? Whereas /64 is strongly recommended
unless you have a very good reason to do otherwise.

Note that the prefix address is usually reserved as the anycast address
for that prefix. Use any other address in the prefix for anycas host
addresses.

> One of the strange things is that the reported IP address mask is not the
> one I set up.

/128 just means it is an individual address. Prefixes and netmasks are a
local connfiguration thing, they do not travel in packets across
networks, except in routing or configuration protocols. Does your server
run this kind of service ?

> I also have some stuff running on top of my router, one the notable things
> is a DNS.

What router ?

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