[Cerowrt-devel] frequency of RAs from 6relayd

[Cerowrt-devel] frequency of RAs from 6relayd

[Michael Richardson]

I am seeing a problem where the IPv6 default on a number of systems
that use RA to get it is going away on a regular basis.  CeroWrt 3.8 is
the source of RA and IPv6 default routes everywhere.  A /48 is delegated
(manually) from my ISP, and configured for each subnet.

There is no way that I can see to specify or find out what the lifetime
/ frequency of the RAs are in the UI.  In /etc/config/6relayd, I see: 

config server 'default'
        option rd 'server'
        option compat_ula '1'
        option always_assume_default '1'
        option fallback_relay 'ndp'
        list network 'VoIP'
        list network 'gw00'
        list network 'gw01'
        list network 'gw10'
        list network 'gw11'
        list network 'se00'
        list network 'services'
        list network 'sw00'
        list network 'sw10'
        list network 'trusted'

It is my understanding that 6relayd is responsible for sending out RAs.

On my desktop:

obiwan-[~] mcr 10187 %sudo rdisc6 eth0
Soliciting ff02::2 (ff02::2) on eth0...

Hop limit                 :    undefined (      0x00)
Stateful address conf.    :          Yes
Stateful other conf.      :          Yes
Router preference         :       medium
Router lifetime           :         1800 (0x00000708) seconds
Reachable time            :  unspecified (0x00000000)
Retransmit time           :  unspecified (0x00000000)
 Source link-layer address: 76:44:01:76:5D:CC
 MTU                      :         1500 bytes (valid)
 from fe80::7444:1ff:fe76:5dcc

(5dcc is indeed my CeroWRT)

while the router lifetime given is 30 minutes, I am wondering if
something else is up.  I would have thought I'd see a prefix advertised
here.

As my MP3 streamer one of the machines affected, when it loses it's IP, 
it either falls off of NFS or the TCP stream breaks, and things go
quiet.

I've ssh'ed into my MP3 server (over v4), and I'm running:
     watch ip -6 route ls
and  sudo tcpdump -i eth0 -n -p ip6 and icmp6   
in two windows.

-- 
]               Never tell me the odds!                 | ipv6 mesh networks [ 
]   Michael Richardson, Sandelman Software Works        | network architect  [ 
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [ 
	

Re: [Cerowrt-devel] frequency of RAs from 6relayd

[Dave Taht]

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There is kind of a conflict on RA handling between dnsmasq and 6relayd
going on - back in january, dnsmasq was "winning", and the default. Since
then the 6relayd stuff has evolved something considerable, and I have not
looked into changing things around, nor how they should be changed around.

Try disabling dnsmasq's RA handling.

On Wed, Jun 12, 2013 at 10:14 AM, Michael Richardson <mcr@sandelman.ca>wrote:

>
> I am seeing a problem where the IPv6 default on a number of systems
> that use RA to get it is going away on a regular basis.  CeroWrt 3.8 is
> the source of RA and IPv6 default routes everywhere.  A /48 is delegated
> (manually) from my ISP, and configured for each subnet.
>
> There is no way that I can see to specify or find out what the lifetime
> / frequency of the RAs are in the UI.  In /etc/config/6relayd, I see:
>
> config server 'default'
>         option rd 'server'
>         option compat_ula '1'
>         option always_assume_default '1'
>         option fallback_relay 'ndp'
>         list network 'VoIP'
>         list network 'gw00'
>         list network 'gw01'
>         list network 'gw10'
>         list network 'gw11'
>         list network 'se00'
>         list network 'services'
>         list network 'sw00'
>         list network 'sw10'
>         list network 'trusted'
>
> It is my understanding that 6relayd is responsible for sending out RAs.
>
> On my desktop:
>
> obiwan-[~] mcr 10187 %sudo rdisc6 eth0
> Soliciting ff02::2 (ff02::2) on eth0...
>
> Hop limit                 :    undefined (      0x00)
> Stateful address conf.    :          Yes
> Stateful other conf.      :          Yes
> Router preference         :       medium
> Router lifetime           :         1800 (0x00000708) seconds
> Reachable time            :  unspecified (0x00000000)
> Retransmit time           :  unspecified (0x00000000)
>  Source link-layer address: 76:44:01:76:5D:CC
>  MTU                      :         1500 bytes (valid)
>  from fe80::7444:1ff:fe76:5dcc
>
> (5dcc is indeed my CeroWRT)
>
> while the router lifetime given is 30 minutes, I am wondering if
> something else is up.  I would have thought I'd see a prefix advertised
> here.
>
> As my MP3 streamer one of the machines affected, when it loses it's IP,
> it either falls off of NFS or the TCP stream breaks, and things go
> quiet.
>
> I've ssh'ed into my MP3 server (over v4), and I'm running:
>      watch ip -6 route ls
> and  sudo tcpdump -i eth0 -n -p ip6 and icmp6
> in two windows.
>
> --
> ]               Never tell me the odds!                 | ipv6 mesh
> networks [
> ]   Michael Richardson, Sandelman Software Works        | network
> architect  [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails
>    [
>
> _______________________________________________
> Cerowrt-devel mailing list
> Cerowrt-devel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cerowrt-devel
>



-- 
Dave Täht

Fixing bufferbloat with cerowrt:
http://www.teklibre.com/cerowrt/subscribe.html

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Re: [Cerowrt-devel] frequency of RAs from 6relayd

[mcr]

Dave Taht <dave.taht@gmail.com> wrote:
    DT> There is kind of a conflict on RA handling between dnsmasq and 6relayd going on
    DT> - back in january, dnsmasq was "winning", and the default. Since then the
    DT> 6relayd stuff has evolved something considerable, and I have not looked into
    DT> changing things around, nor how they should be changed around.

    DT> Try disabling dnsmasq's RA handling.

okay. deleted "enable-ra" from /etc/dnsmasq.conf

/etc/rc.d/S60dnsmasq restart

takes along time...  finally finished.