Re: [Dnsmasq-discuss] [PATCH] DHCPv6: Honor assigning IPv6 address based on MAC address
On Tue, Apr 21, 2020 at 04:16:43PM +0200, Pali Rohár wrote: > On Friday 07 February 2020 23:08:32 Pali Rohár wrote: > > On Monday 17 December 2018 18:41:09 Pali Rohár wrote: > Hello! > > I have not got any reply about this patch for years. > > So I would like to know, is some spam filter eating my emails and > therefore patch was not delivered? > > Can somebody confirm if Simon got my patch or should I probably resent > it from different email address, to prevent spam filter problems? Here NOT the project lead. In the 17 months since the original post on assigning IPv6 address based on MAC address has dnsmasq seen many code changes. Including IPv6 address assignment, even through patches. I do have seen the reminders on "please review my patch". Please accept this posting as "your patch from 2018-12-17 is rejected". In case of a "Why?", be prepared for being ignored. Try to understand that explaining why patch is not good enough does cost human energy. Now we can go on. Make a new start. Install the latest version of dnsmasq. Use it in your scenario. Find out if you can use it in your scenario. Report your use case. Make some effort to explain that more people can benefit from your use case, create awareness. Let's assume dnsmasq doesn't fit YOUR use case. And you modify it so it does fit your case. Then you have a fresh patch. Sending that patch to this mailinglist is no garantee for acceptance. I agree that being ignored does cost human energy. Sad, but true. What I'm now trying is to break the loop of repeated "review my patch". Send UPDATED versions for patches (stop retransmitting patches that are most likely outdated.) Regards Geert Stappers P.S. Simon, I think it is a good thing to have a canned reply like: Patch as been recieved, reviewed and rejected. Please understand that explaining "why the reject" will drain resources from the project we both care about. No hardfeelings, feel free to retry. ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 host-id
On Tue, Apr 21, 2020 at 09:47:35AM -0400, Jiawen Chen wrote:
> On Tue, Apr 21, 2020 at 3:01 AM Geert Stappers wrote:
> > On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote:
> > >
> > > I'd like to use DHCPv6 and IPv6, using the host-id-only option.
> > >
> > > ```
> > > # Enable IPv6 Router Advertisement.
> > > enable-ra
> > >
> > > # Enable DHCPv6. Serve a range for each VLAN.
> > > dhcp-range=::0:2,::0:500,constructor:br0,slaac
> >
> > note the interface
> >
> >
> > >
> > > # Assign 192.168.0.150 and [::0:1000] to my living room pc
> > >
> > dhcp-host=,192.168.0.150,[::0:1000],livingroom.internal,12h
> > >
> > > # Assign 192.168.0.151 and [::0:1001] to my file server
> > >
> > dhcp-host=,192.168.0.151,[::0:1001],fileserver.internal,12h
> > > ```
> > >
> > > Sadly, the host-id-only notation ([::0:1000]) does not appear permitted
> > > when dnsmasq parses /etc/hosts.
> > >
> > > Any suggestions would be greatly appreciated!
> >
> > FWIW I suggest configuration syntax that allows
> >
> >
> >
> > dhcp-host=,192.168.0.150,[interface(br0)::0:1000],livingroom.internal,12h
> >
> >
> Thanks for the suggestion - I will try it tonight. Is your suggested
> notation of \[interface()\] documented anywhere?
Nope ...
> I can't seem to find it on the man page after looking carefully. In
> particular, the string "interface(" does not appear.
... because it is only a suggestion. Sorry for not writing
} FWIW I suggest implementation of configuration syntax that allows
}
}
dhcp-host=,192.168.0.150,[interface(br0)::0:1000],livingroom.internal,12h
Groeten
Geert Stappers
--
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Re: [Dnsmasq-discuss] DNS set using dhcp-host expires?
On Tue, Apr 21, 2020 at 09:57:34AM -0400, Jiawen Chen wrote: > On Tue, Apr 21, 2020 at 3:06 AM Geert Stappers wrote: > > On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > > > > > > I'm using dnsmasq for DHCP + DNS on my home LAN and use dhcp-host to > > > statically assign an IP address and hostname. However, I'm discovering > > > that > > > while it works most of the time, sometimes, ssh for example, can't find > > > the > > > host by name, only IP. One instance is a Linux VM. Initially I can ssh > > > into > > > the VM. But if I power down the VM for say a few days, and start it back > > > up, the name is missing (even though it is somehow assigned the same IP > > > (it > > > keeps its MAC)). > > > > > > dnsmasq.conf: > > > ``` > > > # other irrelevant stuff > > > ... > > > # Assign 192.168.0.150 to my living room pc > > > dhcp-host=,192.168.0.150,livingroom.internal,infinite > > > > > > # Assign 192.168.0.151 to my file server > > > dhcp-host=,192.168.0.151,fileserver.internal,infinite > > > ``` > > > > I suggest to change the ',infinite' into something like ',12h' for > > the servers that are be powered-off of for several days. > > > > What I think is that the DNS cache entry expires > > ( and I think that it is valid behaviour.) > > > > > > Expriment that can be done: > > > > * Restart dnsmasq, so it forgets about dhcp-hosts in DNS cache > > * Check cache dump with SIGUSR1 > > * Power-on an infinite DHCP client e.g. the Linux VM > > * Check cache dump with SIGUSR1 > > * Regular work with the example Linux VM > > * Power-off the infinite DHCP client > > * Sample several days the cache dump > > * Report when the DNS entry of the powered-off server is gone > > > > Thanks! That makes sense. I will give that a shot. Cool. I look forward on feedback. Groeten Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DNS set using dhcp-host expires?
Thanks! That makes sense. I will give that a shot. On Tue, Apr 21, 2020 at 3:06 AM Geert Stappers wrote: > On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > > Hi, > > > ... > > > > I'm using dnsmasq for DHCP + DNS on my home LAN and use dhcp-host to > > statically assign an IP address and hostname. However, I'm discovering > that > > while it works most of the time, sometimes, ssh for example, can't find > the > > host by name, only IP. One instance is a Linux VM. Initially I can ssh > into > > the VM. But if I power down the VM for say a few days, and start it back > > up, the name is missing (even though it is somehow assigned the same IP > (it > > keeps its MAC)). > > > > dnsmasq.conf: > > ``` > > # other irrelevant stuff > > > > no-resolv > > server=8.8.8.8 > > server=8.8.4.4 > > server=1.1.1.1 > > > > expand-hosts > > domain-needed > > bogus-priv > > local=/internal/ > > > > # Assign 192.168.0.150 to my living room pc > > > dhcp-host=,192.168.0.150,livingroom.internal,infinite > > > > # Assign 192.168.0.151 to my file server > > > dhcp-host=,192.168.0.151,fileserver.internal,infinite > > ``` > > I suggest to change the ',infinite' into something like ',12h' for > the servers that are be powered-off of for several days. > > What I think is that the DNS cache entry expires ( and I think that it > is valid behaviour.) > > Expriment that can be done: > > * Restart dnsmasq, so it forgets about dhcp-hosts in DNS cache > * Check cache dump with SIGUSR1 > * Power-on an infinite DHCP client e.g. the Linux VM > * Check cache dump with SIGUSR1 > * Regular work with the example Linux VM > * Power-off the infinite DHCP client > * Sample several days the cache dump > * Report when the DNS entry of the powered-off server is gone > > > Recipe to sabotage the expriment: > while true > do > nslookup linuxVM > output > process_output > if hostname_not_found > then > exit > fi > sleep 2 hour > done > > because it keeps the DNS entry in cache. > > > > > > For these static DHCP leases, is the best practice to set them in > > /etc/hosts instead? > > > > I also discovered --host-record, which does something very similar. Is > > there an advantage in using one option vs the other? > > > > > Groeten > Geert Stappers > -- > Silence is hard to parse > > ___ > 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-id
On Tue, Apr 21, 2020 at 3:01 AM Geert Stappers wrote:
> On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote:
> > Hi,
> >
> ...
> >
> >
> > Finally, I'd like to use DHCPv6 and IPv6, using the host-id-only option.
> >
> > ```
> > # Enable IPv6 Router Advertisement.
> > enable-ra
> >
> > # Enable DHCPv6. Serve a range for each VLAN.
> > dhcp-range=::0:2,::0:500,constructor:br0,slaac
>
> note the interface
>
>
> >
> > # Assign 192.168.0.150 and [::0:1000] to my living room pc
> >
> dhcp-host=,192.168.0.150,[::0:1000],livingroom.internal,12h
> >
> > # Assign 192.168.0.151 and [::0:1001] to my file server
> >
> dhcp-host=,192.168.0.151,[::0:1001],fileserver.internal,12h
> > ```
> >
> > Sadly, the host-id-only notation ([::0:1000]) does not appear permitted
> > when dnsmasq parses /etc/hosts.
> >
> > Any suggestions would be greatly appreciated!
>
> FWIW I suggest configuration syntax that allows
>
>
>
> dhcp-host=,192.168.0.150,[interface(br0)::0:1000],livingroom.internal,12h
>
>
Thanks for the suggestion - I will try it tonight. Is your suggested
notation of \[interface()\] documented anywhere? I
can't seem to find it on the man page after looking carefully. In
particular, the string "interface(" does not appear.
>
> Groeten
> Geert Stappers
> --
> Silence is hard to parse
>
> ___
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss@lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>
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Re: [Dnsmasq-discuss] [PATCH] DHCPv6: Honor assigning IPv6 address based on MAC address
Hello!
I have not got any reply about this patch for years.
So I would like to know, is some spam filter eating my emails and
therefore patch was not delivered?
Can somebody confirm if Simon got my patch or should I probably resent
it from different email address, to prevent spam filter problems?
On Friday 07 February 2020 23:08:32 Pali Rohár wrote:
> Hello Simon!
>
> Could you please review / comment this patch?
>
> I would like to know what is needed to be fixed or changed, so patch
> could be finally merged.
>
> On Monday 17 December 2018 18:41:09 Pali Rohár wrote:
> > Currently IPv6 addresses are assigned to tuple (IAID, DUID). When system
> > changes IAID/DUID then old assigned IPv6 address cannot be reused, even
> > when in config file was DHCPv6 assignment based on MAC address (and not on
> > DUID).
> >
> > IAID/DUID is changed when rebooting from one operating system to another;
> > or after reinstalling system. In reality it is normal that DUID of some
> > machine is changed, so people rather assign also IPv6 addresses based on
> > MAC address.
> >
> > So assigning IPv6 based on MAC address in dnsmasq is currently semi-broken.
> >
> > This patch tries to fix it and honors IPv6 config rules with MAC address,
> > to always assign particular IPv6 address to specific MAC address (when
> > configured). And ignores the fact if IAID/DUID was changed.
> >
> > Normally IPv6 address should be assigned by IAID/DUID (which also state
> > DHCPv6 RFCs), but dnsmasq has already some support for assigning IPv6
> > address based on MAC address, when users configured in config file.
> >
> > So this patch just tries to fix above problem for user configuration with
> > MAC addresses. It does not change assignment based on DUID.
> >
> > Also this patch adds support for allowing IPv6 address to be associated
> > with multiple hardware addresses, and gives dnsmasq permission to abandon a
> > lease. This is similar functionality as already supported for IPv4 address.
> > ---
> > man/dnsmasq.8 | 9 ++---
> > src/rfc3315.c | 62
> > ++-
> > 2 files changed, 59 insertions(+), 12 deletions(-)
> >
> > diff --git a/man/dnsmasq.8 b/man/dnsmasq.8
> > index f01a5ba..8614f08 100644
> > --- a/man/dnsmasq.8
> > +++ b/man/dnsmasq.8
> > @@ -1068,10 +1068,13 @@ will only match a
> > Token-Ring hardware address, since the ARP-address type for token ring
> > is 6.
> >
> > -As a special case, in DHCPv4, it is possible to include more than one
> > -hardware address. eg:
> > +It is possible to include more than one hardware address. eg for IPv4:
> > .B --dhcp-host=11:22:33:44:55:66,12:34:56:78:90:12,192.168.0.2
> > -This allows an IP address to be associated with
> > +or for IPv6:
> > +.B --dhcp-host=11:22:33:44:55:66,12:34:56:78:90:12,[::2]
> > +or for both:
> > +.B --dhcp-host=11:22:33:44:55:66,12:34:56:78:90:12,192.168.0.2,[::2]
> > +This allows an IPv4 and/or IPv6 address to be associated with
> > multiple hardware addresses, and gives dnsmasq permission to abandon a
> > DHCP lease to one of the hardware addresses when another one asks for
> > a lease. Beware that this is a dangerous thing to do, it will only
> > diff --git a/src/rfc3315.c b/src/rfc3315.c
> > index a20776d..c83cf2d 100644
> > --- a/src/rfc3315.c
> > +++ b/src/rfc3315.c
> > @@ -54,7 +54,7 @@ static struct prefix_class
> > *prefix_class_from_context(struct dhcp_context *conte
> > #endif
> > static void mark_context_used(struct state *state, struct in6_addr *addr);
> > static void mark_config_used(struct dhcp_context *context, struct in6_addr
> > *addr);
> > -static int check_address(struct state *state, struct in6_addr *addr);
> > +static int check_address(struct state *state, struct dhcp_config *config,
> > struct in6_addr *addr);
> > static void add_address(struct state *state, struct dhcp_context *context,
> > unsigned int lease_time, void *ia_option,
> > unsigned int *min_time, struct in6_addr *addr, time_t
> > now);
> > static void update_leases(struct state *state, struct dhcp_context
> > *context, struct in6_addr *addr, unsigned int lease_time, time_t now);
> > @@ -746,7 +746,7 @@ static int dhcp6_no_relay(struct state *state, int
> > msg_type, void *inbuff, size_
> > /* If the client asks for an address on the same network as
> > a configured address,
> >offer the configured address instead, to make moving to
> > newly-configured
> >addresses automatic. */
> > - if (!(c->flags & CONTEXT_CONF_USED) && config_valid(config,
> > c, ) && check_address(state, ))
> > + if (!(c->flags & CONTEXT_CONF_USED) && config_valid(config,
> > c, ) && check_address(state, config, ))
> > {
> > req_addr = addr;
> > mark_config_used(c, );
> > @@ -755,8 +755,14 @@ static int dhcp6_no_relay(struct state *state, int
> >
Re: [Dnsmasq-discuss] IPv6 host-id
On Tuesday 21 April 2020 08:27:49 Geert Stappers wrote: > On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > > # Assign 192.168.0.150 and [::0:1000] to my living room pc > > dhcp-host=,192.168.0.150,[::0:1000],livingroom.internal,12h > > > > # Assign 192.168.0.151 and [::0:1001] to my file server > > dhcp-host=,192.168.0.151,[::0:1001],fileserver.internal,12h > > ``` > > > > Sadly, the host-id-only notation ([::0:1000]) does not appear permitted > > when dnsmasq parses /etc/hosts. > > > > Any suggestions would be greatly appreciated! > > FWIW I suggest configuration syntax that allows > > > dhcp-host=,192.168.0.150,[interface(br0)::0:1000],livingroom.internal,12h Hello Jiawen! Beware that IPv6 address does not have to be assigned based on MAC address settings in config file. MAC to IPv6 assignment is not enforced by dnsmasq and if your DHCPv6 client changes DUID or IAID (e.g. dualbooting to different OS or PXE or reinstalling OS) then some another free IPv6 address would be assigned for your PC identified by . There is my pending patch which should fix this problem and when user want then IPv6 address would be enforced for particular MAC address. -- Pali Rohár pali.ro...@gmail.com ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] DHCPv6 with IPv4 address in last 32 bits of IPv6 address: ideas?
Hello, I am working on replacing static IP addresses in our network by static DHCP leases (which is in turn preparation for PXE). For IPv4, this is easily doable, but for IPv6 this is a bit of a challenge because of the following: In our case, all services directly attached to the internet are dual-stack. We make IPv6 addresses easy to remember by placing corresponding /32s in the last 32 bits of /128s. For example, 98.98.98.98's dual-stack IPv6 address would become 2a01:ac00::$something:98:98:98:98. That way, we only have to remember our prefix and the IPv4 address, increasing IPv6 adoption rates. Of course, when providing our network with IPv6 addresses by DHCP, this will become a bit of a challenge. I would not expect dnsmasq to support this very specific way of assigning IPv6 addresses, but I am wondering if others on the mailing list use a similar address format, and if so, how they have automated this. Especially as I would have to link the IPv6 and IPv4 addresses on the DHCP side. Ideas are welcome. Met vriendelijke groeten, William Edwards T. 040 - 711 44 96 E. wedwa...@cyberfusion.nl ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
[Dnsmasq-discuss] Dnsmasq-controller for Kubernetes
Hi, I'm using Dnsmasq in Kubernetes as DNS- and DHCP-server to organize network-booting server farm for long time. At this moment I glad to introduce dnsmasq-controller for Kubernetes, to dynamically reconfigure dnsmasq any time when new hosts and Netboot-servers added. Dnsmasq-controller also uses leader election to prevent running multiple DHCP-servers in one time. Hopefully you'll find this useful: https://github.com/kvaps/dnsmasq-controller/ - kvaps ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 host-id
On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > Hi, > ... > > > Finally, I'd like to use DHCPv6 and IPv6, using the host-id-only option. > > ``` > # Enable IPv6 Router Advertisement. > enable-ra > > # Enable DHCPv6. Serve a range for each VLAN. > dhcp-range=::0:2,::0:500,constructor:br0,slaac note the interface > > # Assign 192.168.0.150 and [::0:1000] to my living room pc > dhcp-host=,192.168.0.150,[::0:1000],livingroom.internal,12h > > # Assign 192.168.0.151 and [::0:1001] to my file server > dhcp-host=,192.168.0.151,[::0:1001],fileserver.internal,12h > ``` > > Sadly, the host-id-only notation ([::0:1000]) does not appear permitted > when dnsmasq parses /etc/hosts. > > Any suggestions would be greatly appreciated! FWIW I suggest configuration syntax that allows dhcp-host=,192.168.0.150,[interface(br0)::0:1000],livingroom.internal,12h Groeten Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DNS set using dhcp-host expires?
On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > Hi, > ... > > I'm using dnsmasq for DHCP + DNS on my home LAN and use dhcp-host to > statically assign an IP address and hostname. However, I'm discovering that > while it works most of the time, sometimes, ssh for example, can't find the > host by name, only IP. One instance is a Linux VM. Initially I can ssh into > the VM. But if I power down the VM for say a few days, and start it back > up, the name is missing (even though it is somehow assigned the same IP (it > keeps its MAC)). > > dnsmasq.conf: > ``` > # other irrelevant stuff > > no-resolv > server=8.8.8.8 > server=8.8.4.4 > server=1.1.1.1 > > expand-hosts > domain-needed > bogus-priv > local=/internal/ > > # Assign 192.168.0.150 to my living room pc > dhcp-host=,192.168.0.150,livingroom.internal,infinite > > # Assign 192.168.0.151 to my file server > dhcp-host=,192.168.0.151,fileserver.internal,infinite > ``` I suggest to change the ',infinite' into something like ',12h' for the servers that are be powered-off of for several days. What I think is that the DNS cache entry expires ( and I think that it is valid behaviour.) Expriment that can be done: * Restart dnsmasq, so it forgets about dhcp-hosts in DNS cache * Check cache dump with SIGUSR1 * Power-on an infinite DHCP client e.g. the Linux VM * Check cache dump with SIGUSR1 * Regular work with the example Linux VM * Power-off the infinite DHCP client * Sample several days the cache dump * Report when the DNS entry of the powered-off server is gone Recipe to sabotage the expriment: while true do nslookup linuxVM > output process_output if hostname_not_found then exit fi sleep 2 hour done because it keeps the DNS entry in cache. > > For these static DHCP leases, is the best practice to set them in > /etc/hosts instead? > > I also discovered --host-record, which does something very similar. Is > there an advantage in using one option vs the other? > Groeten Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] DNS set using dhcp-host doesn't exist until it connects?
On Mon, Apr 20, 2020 at 10:27:11PM -0400, Jiawen Chen wrote: > Hi, > > I recently started exploring the more advanced features of dnsmasq and have > been very impressed. :-) > ... good reports ... > > Any suggestions would be greatly appreciated! Separate issues should have seperate mail threads. (now work in progress) Groeten Geert Stappers -- Silence is hard to parse ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
