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Today's Topics:
1. Re: Dhcpd with ipv6 support (Robert Socha)
2. Re: Latest lease entry not the one offered to the client
(Niall O'Reilly)
3. Re: Latest lease entry not the one offered to the client
(glenn.satch...@uniq.com.au)
----------------------------------------------------------------------
Message: 1
Date: Wed, 26 Aug 2020 09:16:39 +0200
From: Robert Socha <so...@socha.it>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Dhcpd with ipv6 support
Message-ID: <b106accd-c149-b403-31d5-6a19fb9af...@socha.it>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi,
Try luck with dnsmasq. It's GPL2 and have RA support (--enable-ra).
http://www.thekelleys.org.uk/dnsmasq/doc.html
Regards
W dniu 26.08.2020 o?06:33, Anjali Krishna pisze:
> Hi,
>
> Since my embedded board has to function as an Wi-Fi hotspot, adding
> radvd functionality is on my hands where exactly I am helpless.
>
> On Wed, 26 Aug 2020, 9:43 am , <glenn.satch...@uniq.com.au
> <mailto:glenn.satch...@uniq.com.au>> wrote:
>
> Hi Anjali
>
> Maybe the network switch or router has a builtin router advertisement
> feature?
>
> regards,
> -glenn
>
> On 2020-08-26 13:54, Anjali Krishna wrote:
> > Hi,
> >
> >? ? ?I tried the radvd daemon in yocto.
> > But before I could continue further I came across the license info of
> > Radvd. I am allowed only to use packages which has GPL v2 license
> > unfortunately radvd has BSD license.(it is a constraint from our
> > higher development team).
> >
> > Is there any other way I can move forward.?. I searched for any
> > alternative for radvd but could not find it
> >
> > I am stuck here. Any further suggestion would be appreciated
> >
> > Regards,
> >
> > Anjali
> >
> > On Mon, 10 Aug 2020, 10:41 pm Bill Shirley,
> > <b...@c3po.polymerindustries.biz
> <mailto:b...@c3po.polymerindustries.biz>> wrote:
> >
> >> No matter who the vendor is, for IPv6 all devices require a Router
> >> Advertisement Daemon.
> >>
> >> iDevices support DHCPv6.? Most Android devices do not.? For your
> >> reading pleasure:
> >> https://issuetracker.google.com/issues/36949085
> >>
> >> Bill
> >> On 8/9/2020 6:47 PM, Joshua Stark wrote:
> >> Hi Krishna,
> >>
> >> iPhone's are the same.
> >>
> >> You need to use a Router Advertisement Daemon to send back the flags
> >> needed for the client to go looking for a DHCPv6 server.
> >>
> >> There is lots of good resources out on the web, what you need to do
> >> is look at DHCPv6 vs SLAAC (Stateless Address Auto-Configuration)
> >>
> >> For the RAD, I use radvd on my gateway, the configuration can be
> >> found here: https://linux.die.net/man/5/radvd.conf
> >>
> >> I use the options:
> >> # Set to on to turn on Stateful DHCPv6
> >> # If set to off, then will use Stateless IPv6
> >> AdvManagedFlag on;
> >> AdvOtherConfigFlag on;
> >>
> >> To tell the clients to go looking for DHCPv6
> >>
> >> Thanks
> >> Josh
> >>
> >> On 10/8/20 07:59, Bill Shirley wrote:
> >>
> >> Most Android devices don't support getting an IPv6 address via DHCP.
> >>
> >> Bill
> >> On 8/9/2020 4:11 AM, Anjali Krishna wrote:
> >>
> >> Hi all,
> >>
> >> I am testing ipv6 support between my embedded board and Android
> >> phone.
> >>
> >> Two embedded boards are getting connected with ipv6 when running
> >> dhcpd - 6 in server and dhclient - 6 in client side.
> >>
> >> As an extension of the testing,I configured my board as ipv6 hostpot
> >> and tries connecting my android phone which supports ipv6.. The
> >> process got stuck at obtaining ip address message in phone wifi
> >> screen.
> >>
> >> I m doubting some configuration is missing in my wifi server dhcpd
> >> configuration.
> >>
> >> Any help would be appreciated
> >>
> >> Regard,
> >> Anjali
> >>
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------------------------------
Message: 2
Date: Wed, 26 Aug 2020 10:58:41 +0100
From: "Niall O'Reilly" <niall.orei...@ucd.ie>
To: "Users of ISC DHCP" <dhcp-users@lists.isc.org>
Subject: Re: Latest lease entry not the one offered to the client
Message-ID: <1e25305f-762a-48ca-b725-5b3014106...@ucd.ie>
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
I haven't seen follow-up to this yet, so here is my tuppence-worth.
On 18 Aug 2020, at 4:07, ksladic wrote:
> Regarding lease file cleanup:
> 1. Does it remove all expired leases?
No, because removing them would not be consistence with the
[service definition](https://tools.ietf.org/html/rfc2131#section-2.2):
"The
allocation mechanism (the collection of DHCP servers) guarantees not
to reallocate that address within the requested time and __attempts
to
return the same network address each time the client requests an
address__." (My emphasis)
This means that an expired lease should be retained for use in case the
client ever requests it again.
> 2. Does it remove duplicate leases ... keeping only last valid one?
Yes, but a lease is identified for this purpose by its IP address,
not by any property of the client, such as MAC address or UUID,
or so I recall.
It follows that an expired lease which, because of depletion of the
lease pool, is assigned to a different client, may lose its association
with an earlier client.
> 3. In general (before or after lease file cleanup) if I would like to
> find
> the latest valid leased IP for a client, is it best to go through
> whole file
> and pick valid lease with latest timestamp? Because as I understand I
> can
> not rely on the order of leases in the file.
It's easy but tedious to write a script to do this. I may have one which
was
once in production in some backup somewhere, but you can probably code
one
faster than I could find it again.
I hope this helps.
Niall O'Reilly
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Message: 3
Date: Wed, 26 Aug 2020 20:22:01 +1000
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Latest lease entry not the one offered to the client
Message-ID: <2ca5d0b4a30bb792370a17f4c0cf8...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Just to add to Niall's useful reply, the lease file format is documented
in the dhcpd.leases(5) man page.
regards,
-glenn
On 2020-08-26 19:58, Niall O'Reilly wrote:
> I haven't seen follow-up to this yet, so here is my tuppence-worth.
>
> On 18 Aug 2020, at 4:07, ksladic wrote:
>
>> Regarding lease file cleanup:
>> 1. Does it remove all expired leases?
>
> No, because removing them would not be consistence with the
> service definition [1]:
>
> "The
> allocation mechanism (the collection of DHCP servers) guarantees not
> to reallocate that address within the requested time and attempts to
> return the same network address each time the client requests an
> address." (My emphasis)
>
> This means that an expired lease should be retained for use in case
> the
> client ever requests it again.
>
>> * Does it remove duplicate leases ... keeping only last valid one?
>
> Yes, but a lease is identified for this purpose by its IP address,
> not by any property of the client, such as MAC address or UUID,
> or so I recall.
>
> It follows that an expired lease which, because of depletion of the
> lease pool, is assigned to a different client, may lose its
> association
> with an earlier client.
>
>> * In general (before or after lease file cleanup) if I would like
>> to find the latest valid leased IP for a client, is it best to go
>> through whole file and pick valid lease with latest timestamp?
>> Because as I understand I can not rely on the order of leases in the
>> file.
>
> It's easy but tedious to write a script to do this. I may have one
> which was
> once in production in some backup somewhere, but you can probably code
> one
> faster than I could find it again.
>
> I hope this helps.
>
> Niall O'Reilly
>
> Links:
> ------
> [1] https://tools.ietf.org/html/rfc2131#section-2.2
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> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
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