Re: [Dnsmasq-discuss] IPv6 host registration in DNS
Hi Robert,
>
> By the way: What did you set in the IPv6 address settings of your FB
> ("Heimnetzübersicht" -> "Netzwerkeinstellungen" -> "IPv6-Adressen")?
My IPv6 config at the FB: (sorry only c)
Unique Local Addresses: keine Unique Local Addresses (ULA) zuweisen
(nicht empfohlen)
Weitere IPv6-Router im Heimnetz: Diese FRITZ!Box stellt den
Standard-Internetzugang zur Verfügung
DNSv6-Server im Heimnetz: DNSv6-Server auch über Router Advertisement
bekanntgeben (RFC 5006)
Lokaler DNSv6-Server:
DHCPv6-Server im Heimnetz: DHCPv6-Server in der FRITZ!Box deaktivieren:
Das M- und das O-Flag in den Router Advertisement-Nachrichten der
FRITZ!Box aktivieren (SLAAC möglich)
Best regards,
Maik
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Re: [Dnsmasq-discuss] IPv6 host registration in DNS
Hi, The problem is with SLAAC addresses: DNSMASQ has no idea in an IPv6-only network about the hostnames (it has not seen any DHCP request containing a host name) nor it knows about the actual IP addresses. In SLAAC mode, dnsmasq only sends RA packets around and the client builds the IP address on its own. But the generated IP address is never reported back, the client just uses it. With the cool dnsmasq workaround called "ra-names", the trick is to use some information from the previous IPv4 DHCP request: dnsmasq learns about the host name and the MAC address of the client! It then builds the SLAAC address on its own and tries by ping if the IP address responds. And if that's the case, it registers a hostname for the SLAAC address. But it needs both the MAC and the hostname! Unfortunately this does not work with Windows, if random identifiers are enabled (which is by default) and if firewall is enabled. To register hostnames in IPv6-only environments, you need to use stateful DHCPv6 and disable SLAAC. But unfortunately not all clients work with DHCPv6! Some only listen to RAs by default! Currently e.g. Windows uses DHCPv6 if announced by the RA to do so, but Android phones are not able to do this. With SLAAC disabled they won't get an address. Another approach would be to allow both: SLAAC and stateful DHCPv6. All clients that support DHCPv6 would get 2 addresses (a SLAAC one and stateful one), but the hostname would always point to the stateful one. Problem in DSL environments is the fact that the lease time works against you. The stateful address would be kept assigned until its lease times out and this can be a lot later that the PPP link went down. So it's not recommeneded at all for PPP links with dynamic IPs. Hope this explanation helps, Uwe - Uwe Schindler Achterdiek 19, D-28357 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -Original Message- > From: Dnsmasq-discuss [mailto:dnsmasq-discuss- > boun...@lists.thekelleys.org.uk] On Behalf Of Robert N > Sent: Saturday, September 16, 2017 2:50 PM > To: dnsmasq-discuss@lists.thekelleys.org.uk > Subject: [Dnsmasq-discuss] IPv6 host registration in DNS > > Hello all, > > I'm trying to replace the DNS/DHCP of my FritzBox home router with > dnsmasq. > > For IPv4 everything seems to work fine, i.e. when clients request an > IPv4 address, dnsmasq registers their hostnames, so name resolution for > local machines works. > > But it does not seem to work for IPv6. I want the clients to do SLAAC > but still dnsmasq should serve records for local hosts if asked > for. > If I understood correctly, then dnsmasq will only register the hostnames > for which it receives a DHCP request. Does this require the hosts to > request an IP address? Or will the hostnames be added to DNS also if > just the DNS server information is requested? > > So I probably should configure what is called stateless DHCPv6: > > > no-resolv > server=8.8.8.8 > server=8.8.4.4 > server=2001:4860:4860:: > server=2001:4860:4860::8844 > > domain=home.example.net > local=/home.example.net/ > domain-needed > bogus-priv > expand-hosts > stop-dns-rebind > > enable-ra > ra-param=high > > read-ethers > dhcp-option=option6:dns-server,[fd00::] > dhcp-option=option6:domain-search,home.example.net > dhcp-range=::,constructor:lan,ra-names,ra-stateless > > # This will tell DHCP clients to not ask for proxy information > # Some clients, like Windows 7, will constantly ask if not told NO > # > https://wiki.openwrt.org/doc/howto/dhcp.dnsmasq#log_continuously_filled > _with_dhcpinformdhcpack > dhcp-option=252,"\n" > > log-async=10 > log-dhcp > > > However, I don't get dnsmasq to return records for local hostnames. > Is this configuration basically correct? Or am I missing something? > > > Best regards, > Robert > > ___ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 host registration in DNS
Hi Maik,
Thanks for the hint.
The thing is that my FB has native IPv6 connectivity, i.e. it receives a
prefix from the provider (which changes now and then, e.g. after
disconnect).
So IMHO there is no need to assign ULA addresses via DHCP. The clients
already configure themselves correctly via SLAAC.
According to the dnsmasq manpage:
If a dhcp-range is only being used for stateless DHCP and/or SLAAC, then
the address can be simply ::
--dhcp-range=::,constructor:eth0
That's what I've used. So AFAIU the clients now configure themselves and
only ask dnsmasq (via DHCPv6) for information about the DNSv6 server.
However, I don't know if dnsmasq will add to its DNS the hostnames of
clients requesting DNS information via DHCP only (and not getting
assigned any address).
By the way: What did you set in the IPv6 address settings of your FB
("Heimnetzübersicht" -> "Netzwerkeinstellungen" -> "IPv6-Adressen")?
Best regards,
Robert
On 17 Sep 2017, at 15:46, Maik Weidemann wrote:
Hi Robert,
I use this parameter for IPv6 with a FB:
enable-ra
ra-param=high,60,7200
dhcp-range=fd00:cafe:beef:1:0050::,fd00:cafe:beef:1:F000::,64,2h
Best regards,
Maik
Am 16.09.2017 um 14:50 schrieb Robert N:
Hello all,
I'm trying to replace the DNS/DHCP of my FritzBox home router with
dnsmasq.
For IPv4 everything seems to work fine, i.e. when clients request an
IPv4 address, dnsmasq registers their hostnames, so name resolution
for local machines works.
But it does not seem to work for IPv6. I want the clients to do SLAAC
but still dnsmasq should serve records for local hosts if asked
for.
If I understood correctly, then dnsmasq will only register the
hostnames for which it receives a DHCP request. Does this require the
hosts to request an IP address? Or will the hostnames be added to DNS
also if just the DNS server information is requested?
So I probably should configure what is called stateless DHCPv6:
no-resolv
server=8.8.8.8
server=8.8.4.4
server=2001:4860:4860::
server=2001:4860:4860::8844
domain=home.example.net
local=/home.example.net/
domain-needed
bogus-priv
expand-hosts
stop-dns-rebind
enable-ra
ra-param=high
read-ethers
dhcp-option=option6:dns-server,[fd00::]
dhcp-option=option6:domain-search,home.example.net
dhcp-range=::,constructor:lan,ra-names,ra-stateless
# This will tell DHCP clients to not ask for proxy information
# Some clients, like Windows 7, will constantly ask if not told NO
#
https://wiki.openwrt.org/doc/howto/dhcp.dnsmasq#log_continuously_filled_with_dhcpinformdhcpack
dhcp-option=252,"\n"
log-async=10
log-dhcp
However, I don't get dnsmasq to return records for local
hostnames.
Is this configuration basically correct? Or am I missing something?
Best regards,
Robert
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Re: [Dnsmasq-discuss] IPv6 host registration in DNS
Hi Robert, I use this parameter for IPv6 with a FB: > enable-ra > ra-param=high,60,7200 > dhcp-range=fd00:cafe:beef:1:0050::,fd00:cafe:beef:1:F000::,64,2h Best regards, Maik Am 16.09.2017 um 14:50 schrieb Robert N: > Hello all, > > I'm trying to replace the DNS/DHCP of my FritzBox home router with > dnsmasq. > > For IPv4 everything seems to work fine, i.e. when clients request an > IPv4 address, dnsmasq registers their hostnames, so name resolution > for local machines works. > > But it does not seem to work for IPv6. I want the clients to do SLAAC > but still dnsmasq should serve records for local hosts if asked for. > If I understood correctly, then dnsmasq will only register the > hostnames for which it receives a DHCP request. Does this require the > hosts to request an IP address? Or will the hostnames be added to DNS > also if just the DNS server information is requested? > > So I probably should configure what is called stateless DHCPv6: > > > no-resolv > server=8.8.8.8 > server=8.8.4.4 > server=2001:4860:4860:: > server=2001:4860:4860::8844 > > domain=home.example.net > local=/home.example.net/ > domain-needed > bogus-priv > expand-hosts > stop-dns-rebind > > enable-ra > ra-param=high > > read-ethers > dhcp-option=option6:dns-server,[fd00::] > dhcp-option=option6:domain-search,home.example.net > dhcp-range=::,constructor:lan,ra-names,ra-stateless > > # This will tell DHCP clients to not ask for proxy information > # Some clients, like Windows 7, will constantly ask if not told NO > # > https://wiki.openwrt.org/doc/howto/dhcp.dnsmasq#log_continuously_filled_with_dhcpinformdhcpack > dhcp-option=252,"\n" > > log-async=10 > log-dhcp > > > However, I don't get dnsmasq to return records for local hostnames. > Is this configuration basically correct? Or am I missing something? > > > Best regards, > Robert > > ___ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss signature.asc Description: OpenPGP digital signature ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] IPv6 host registration in DNS
Hello all, I'm trying to replace the DNS/DHCP of my FritzBox home router with dnsmasq. For IPv4 everything seems to work fine, i.e. when clients request an IPv4 address, dnsmasq registers their hostnames, so name resolution for local machines works. But it does not seem to work for IPv6. I want the clients to do SLAAC but still dnsmasq should serve records for local hosts if asked for. If I understood correctly, then dnsmasq will only register the hostnames for which it receives a DHCP request. Does this require the hosts to request an IP address? Or will the hostnames be added to DNS also if just the DNS server information is requested? So I probably should configure what is called stateless DHCPv6: no-resolv server=8.8.8.8 server=8.8.4.4 server=2001:4860:4860:: server=2001:4860:4860::8844 domain=home.example.net local=/home.example.net/ domain-needed bogus-priv expand-hosts stop-dns-rebind enable-ra ra-param=high read-ethers dhcp-option=option6:dns-server,[fd00::] dhcp-option=option6:domain-search,home.example.net dhcp-range=::,constructor:lan,ra-names,ra-stateless # This will tell DHCP clients to not ask for proxy information # Some clients, like Windows 7, will constantly ask if not told NO # https://wiki.openwrt.org/doc/howto/dhcp.dnsmasq#log_continuously_filled_with_dhcpinformdhcpack dhcp-option=252,"\n" log-async=10 log-dhcp However, I don't get dnsmasq to return records for local hostnames. Is this configuration basically correct? Or am I missing something? Best regards, Robert ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
