feature request: radvd RDNSS fe80::1

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habeIchVergessen
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Joined: 04 May 2010
Posts: 431
PostPosted: Thu Jul 23, 2015 8:47    Post subject: feature request: radvd RDNSS fe80::1 Reply with quote
radvd propagates isp dns server in RDNSS.

windows 7/8 doesn't support RDNSS. always resolving names with fe80::1. results in no dns over ipv6.

lollipop (android 5) supports RDNSS. gets isp dns server from radvd advertisment. results in dns without resolving internal names.

possible solution:

- add fe80::1 to br0
- configure "RDNSS fe80::1 {};" in radvd.conf

@dev: pls check side effects of this solution (refer timeline ticket)
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Mile-Lile
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Joined: 24 Feb 2013
Posts: 1634
Location: Belgrade
PostPosted: Thu Jul 23, 2015 18:00    Post subject: Reply with quote
did you tried dibbler with win7? http://klub.com.pl/dhcpv6/
I had problem with win7 too but then I decided to use dnsmasq... I am waiting for win 10 to see if MS solved these problems...
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habeIchVergessen
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Joined: 04 May 2010
Posts: 431
PostPosted: Thu Jul 23, 2015 21:55    Post subject: Reply with quote
configuring fe80::1 on br0 in a startup script solves Windows 7 issue.
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tknarr
DD-WRT Novice


Joined: 28 Mar 2014
Posts: 5
PostPosted: Thu Jul 30, 2015 12:03    Post subject: Reply with quote
Rrgh. This explains many problems I've had getting DNSMasq to answer DNS queries via IPv6. For some reason DNSMasq isn't listening on the global IPv6 address on br0, just the link-local address.

Reason: apparently Android's got some bug in it where it'll only ask for AAAA records via IPv6. I've got a host defined with only an AAAA record and no A record, for testing, and while the Linux and Windows machines can resolve it fine querying via IPv4 the Android devices all come back with DNS lookup failures.
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habeIchVergessen
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Joined: 04 May 2010
Posts: 431
PostPosted: Sun Aug 02, 2015 14:01    Post subject: Reply with quote
workaround

store following code as executable script (modified!!!)
Code:

#! /bin/sh

if [ -z "`pidof dhcp6c`" ]; then
        echo dhcp6c process
        exit 0
fi

overwrite() {
        # override dhcp6c dns servers
        new_domain_name_servers=fe80::1

        /sbin/dhcp6c-state
}

config () {
        script=/mnt/scripts/dhcp6c_static_dns
        cfg=/tmp/dhcp6c.conf
        search="^[ ]*script \".*\";$"
        if [ -x $script -a -z "`grep \"${search/\.\*/$script}\" $cfg`" ]; then
                sed -i "s|${search}| script \"${script}\";|" $cfg
        fi
        killall dhcp6c
        sleep 2
        dhcp6c -c $cfg -T LL ppp0
}

if [ $# -ge 1 ]; then
        case "$1" in
                "-config")
                        config
                        ;;
        esac
else
        overwrite
fi


add to startup script
Code:

# ipv6
ip -6 addr add fe80::1/64 dev br0


add to firewall script
Code:

# static dns server radvd
script=[path to shell script]
[ -x $script ] && $script -config
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tknarr
DD-WRT Novice


Joined: 28 Mar 2014
Posts: 5
PostPosted: Thu Aug 06, 2015 2:33    Post subject: Reply with quote
Question about dnsmasq. It's answering queries on the link-local IPv6 address of br0, but it won't answer queries to the global address even though the interface is configured with it. Is this a deliberate thing in dnsmasq?

Firmware is DD-WRT v3.0-r27506 (07/09/15) std
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habeIchVergessen
DD-WRT User


Joined: 04 May 2010
Posts: 431
PostPosted: Thu Aug 06, 2015 9:53    Post subject: Reply with quote
firewall blocks the request.

try the following command on your router and any other ipv6 device in your network.

Code:

nslookup heise.de <your global ipv6 address>
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tknarr
DD-WRT Novice


Joined: 28 Mar 2014
Posts: 5
PostPosted: Fri Aug 07, 2015 2:23    Post subject: Reply with quote
OK, that makes sense. I'll have to tweak the firewall rules to make the global address behave like the router's IPv4 address: accepts traffic from inside the LAN but not from the WAN side.
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