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Today's Topics:
1. dhclient -P -6 ppp0 does not receive dhcp-server responses
(Udo van den Heuvel)
2. Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses (Rob Janssen)
3. Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses (Udo van den Heuvel)
4. Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses (Michael De Roover)
5. Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses (Udo van den Heuvel)
6. Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses (Udo van den Heuvel)
----------------------------------------------------------------------
Message: 1
Date: Wed, 19 May 2021 16:00:58 +0200
From: Udo van den Heuvel <udo...@xs4all.nl>
To: dhcp-users@lists.isc.org
Subject: dhclient -P -6 ppp0 does not receive dhcp-server responses
Message-ID: <2d9de3cd-7116-de0d-4289-52328b6b8...@xs4all.nl>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
We run fedora 34 on our boxes.
Dhclient stopped receiving responses from dhcp-server.
Dhclient only logs XMT steps.
This happens even with the (ipv6) firewall disabled.
Tcpdump shows the responses arriving.
Because of this I created bug
https://bugzilla.redhat.com/show_bug.cgi?id=1956209.
How can I investigate this issue further and fix it?
Kind regards,
Udo
------------------------------
Message: 2
Date: Wed, 19 May 2021 16:19:26 +0200
From: Rob Janssen <pe1...@amsat.org>
To: dhcp-users@lists.isc.org
Subject: Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses
Message-ID: <33307001-5ae0-b247-fcd3-d25f77959...@pe1chl.nl>
Content-Type: text/plain; charset="utf-8"
I think there is an error in your firewall.
You have "removed all rules for testing", but the policy is set to DROP.
# ip6tables -L -v -n -x
Chain INPUT (policy DROP 211 packets, 57041 bytes)
pkts bytes target prot opt in out source
destination
This means that ALL traffic will be dropped.
You need to do "ip6tables -P INPUT ACCEPT" and test again.
Rob
On 5/19/21 4:00 PM, Udo van den Heuvel wrote:
> Hello,
>
> We run fedora 34 on our boxes.
> Dhclient stopped receiving responses from dhcp-server.
> Dhclient only logs XMT steps.
> This happens even with the (ipv6) firewall disabled.
> Tcpdump shows the responses arriving.
> Because of this I created bug
> https://bugzilla.redhat.com/show_bug.cgi?id=1956209.
>
> How can I investigate this issue further and fix it?
>
> Kind regards,
> Udo
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Message: 3
Date: Wed, 19 May 2021 16:26:58 +0200
From: Udo van den Heuvel <udo...@xs4all.nl>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>, Rob Janssen
<pe1...@amsat.org>
Subject: Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses
Message-ID: <a86e94e7-f354-11bd-c4c8-7c0b4e5a0...@xs4all.nl>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
On 19-05-2021 16:19, Rob Janssen wrote:
> ip6tables -P INPUT ACCEPT
Did that but no change.
Kind regards,
Udo
------------------------------
Message: 4
Date: Wed, 19 May 2021 16:31:31 +0200
From: Michael De Roover <i...@nixmagic.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses
Message-ID:
<e1284c997f72da41aa31cd88ad28db54715ec538.ca...@nixmagic.com>
Content-Type: text/plain; charset="UTF-8"
Fedora uses firewalld alongside iptables I believe, maybe that's
blocking it. It tripped me up for a few days on another service too.
On Wed, 2021-05-19 at 16:26 +0200, Udo van den Heuvel wrote:
> Hello,
>
> On 19-05-2021 16:19, Rob Janssen wrote:
> > ip6tables -P INPUT ACCEPT
>
> Did that but no change.
>
> Kind regards,
> Udo
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
--
Michael De Roover <i...@nixmagic.com>
------------------------------
Message: 5
Date: Wed, 19 May 2021 16:37:31 +0200
From: Udo van den Heuvel <udo...@xs4all.nl>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>, Michael De Roover
<i...@nixmagic.com>
Subject: Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses
Message-ID: <a70a4b8f-7005-481b-7b8e-991b42f15...@xs4all.nl>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
On 19-05-2021 16:31, Michael De Roover wrote:
> Fedora uses firewalld alongside iptables I believe, maybe that's
> blocking it. It tripped me up for a few days on another service too.
No firewalld found.
We use a derivative of the old ADSL4Linux firewall.
Kind regards,
Udo
------------------------------
Message: 6
Date: Wed, 19 May 2021 17:29:24 +0200
From: Udo van den Heuvel <udo...@xs4all.nl>
To: dhcp-users@lists.isc.org
Subject: Re: dhclient -P -6 ppp0 does not receive dhcp-server
responses
Message-ID: <25809d99-bc8c-8f93-3abb-cdb4cec51...@xs4all.nl>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
I found something weird.
I was playing around with the IPv6 side of the ethernet interface that
is the connection to the vdsl modem, and thus carries the PPPoE
connection, etc.
I removed IPv6 from the ethernet interface and also from the vlan
interface over this ethernet.
After restarting pppd (?) I suddenly received responses to dhclient's
prefix requests. (as this sequence (re)starts dhclient and then radvd)
So yes, a bit hairy but I think i got a solution now.
I will close the bug with redhat.
Thank you for thinking about this issue.
Kind regards,
Udo
On 19-05-2021 16:00, Udo van den Heuvel wrote:
> Hello,
>
> We run fedora 34 on our boxes.
> Dhclient stopped receiving responses from dhcp-server.
> Dhclient only logs XMT steps.
> This happens even with the (ipv6) firewall disabled.
> Tcpdump shows the responses arriving.
> Because of this I created bug
> https://bugzilla.redhat.com/show_bug.cgi?id=1956209.
>
> How can I investigate this issue further and fix it?
>
> Kind regards,
> Udo
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
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End of dhcp-users Digest, Vol 151, Issue 8
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