[ntp:hackers] ntpd on ipv6 routers very chatty

Danny Mayer mayer at ntp.isc.org
Wed Oct 22 11:33:46 UTC 2008


John Hay wrote:
> Hi Guys,
> 
> I just updated some of my FreeBSD based routers to the latest 7-stable
> code. This contains ntp 4.2.4p5-a. On these boxes ntpd fills up the
> /var/log/messages file with these kinds of messages every few seconds:
> 
> ########################################
> Oct 22 11:59:52 roof-bkp ntpd[1296]: bind() fd 33, family 28, port 123, scope 0, addr fd9c:6829:597c:10::, in6_is_addr_multicast=0 flags=0x11 fails: Can't assign requested address
> Oct 22 11:59:52 roof-bkp ntpd[1296]: unable to create socket on wlan0 (7177) for fd9c:6829:597c:10::#123
> Oct 22 11:59:52 roof-bkp ntpd[1296]: bind() fd 33, family 28, port 123, scope 0, addr fd9c:6829:597c:10::, in6_is_addr_multicast=0 flags=0x11 fails: Can't assign requested address
> Oct 22 11:59:52 roof-bkp ntpd[1296]: unable to create socket on wlan1 (7178) for fd9c:6829:597c:10::#123
> ########################################
> 
> The addresses that trip them up are ipv6 anycast addresses. They are
> generated automatically if the box is a gateway. Ifconfig of an
> interface looks like this:
> 
> ########################################
> :~ > ifconfig wlan0
> wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         ether 00:80:48:50:9a:0a
>         inet6 fe80::280:48ff:fe50:9a0a%wlan0 prefixlen 64 scopeid 0x7 
>         inet6 fd9c:6829:597c:10:280:48ff:fe50:9a0a prefixlen 64 
>         inet6 fd9c:6829:597c:10:: prefixlen 64 anycast 
>         media: IEEE 802.11 Wireless Ethernet autoselect mode 11a <adhoc>
>         status: running
>         ssid ptabb channel 64 (5320 Mhz 11a) bssid 02:15:6d:53:1f:ee
>         regdomain 55 indoor ecm authmode OPEN privacy OFF txpower 18
>         mcastrate 6 mgmtrate 6 scanvalid 60 wme burst
> :~ >
> ########################################
> 
> So what should happen here? Should it even try to bind to the anycast
> address?
> 
> John

Hi John, it's been a long time.

This is kind of strange. It does not say that something else is bound to
those addresses. I'm not sure I understand what is meant here by the
anycast addresses that the ifconfig shows, but it does seem like a
prefix rather than an address. Can you file a bug report in bugzilla on
this?

Thanks,
Danny


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