[Dnsmasq-discuss] How to run dnsmasq as RA with A bit and O bit but without dhcpv6

Simon Kelley simon at thekelleys.org.uk
Tue Apr 30 10:32:53 BST 2013


On 28/04/13 10:53, Xu He Jie wrote:
> Hi, folks
>
> I am trying to run RA and stateless dhcpv6 in separeted host.
>
> I have tried:
> dnsmasq --interface l3outer -k -d --dhcp-range=2001:0:0:1::,ra-stateless
> --no-resolv -I lo
> But I found it still provide stateless dhcpv6 service.
> How can I run dnsmasq as RA with A bit and O bit, but without stateless
> dhcpv6?
>

Not perfect, but something like

--dhcp-ignore=tag:l3outer

should inhibit DHCP on that interface.

> And I run dnsmasq as stateless dhcpv6 as below:
> dnsmasq --interface l3outer -k -d --dhcp-range=::,static --dhcp-option
> option6:dns-server,[2111:0:0:1::3] --no-resolv -I lo
> I tested that works for me. So it is the right way, right?

Yes, that looks OK.
>
> And another question, I found dnsmasq always provide 'rdnss' whatever
> the mode
>
> 17:47:47.803104 IP6 (class 0xc0, hlim 255, next-header ICMPv6 (58)
> payload length: 88) fe80::4ca5:93ff:fed0:7467 > ff02::1: [icmp6 sum ok]
> ICMP6, router advertisement, length 88
> hop limit 64, Flags [other stateful], pref medium, router lifetime
> 1800s, reachable time 0s, retrans time 0s
> prefix info option (3), length 32 (4): 2001:0:0:1::/64, Flags [onlink,
> auto], valid time 3600s, pref. time 3600s
> 0x0000: 40c0 0000 0e10 0000 0e10 0000 0000 2001
> 0x0010: 0000 0000 0001 0000 0000 0000 0000
> mtu option (5), length 8 (1): 1500
> 0x0000: 0000 0000 05dc
> source link-address option (1), length 8 (1): 4e:a5:93:d0:74:67
> 0x0000: 4ea5 93d0 7467
> rdnss option (25), length 24 (3): lifetime 1200s, addr: 2001:0:0:1::1
> 0x0000: 0000 0000 04b0 2001 0000 0000 0001 0000
> 0x0010: 0000 0000 0001
>
> Is this right behavior?

You should be able to stop it by configuring an empty DNS-server option.

dhcp-option=tag:l3outer, option6:dns-server

Cheers,

Simon.

>
> I will appreciate any help from you!
>
> Thanks
> Alex
>
>
>
>
>
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