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Today's Topics:
1. relay agent dhcrelay goes crazy (IMMO WETZEL)
2. dhcrelay listen at all ifs but should only on dedicated ifs
(IMMO WETZEL)
3. Re: relay agent dhcrelay goes crazy (Patrick Cervicek)
4. Re: dhcrelay listen at all ifs but should only on dedicated
ifs (Patrick Cervicek)
----------------------------------------------------------------------
Message: 1
Date: Wed, 10 Jan 2018 20:21:54 +0000
From: IMMO WETZEL <immo.wet...@adtran.com>
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: relay agent dhcrelay goes crazy
Message-ID:
<f5452071f098e84b91d98fde02860faaf147f...@ex-mb1.corp.adtran.com>
Content-Type: text/plain; charset="windows-1252"
I do see a crazy behavior
Start relay with
dhcrelay -4 -d -iu br_TB104_TMN -id br_TB104_DUT 10.160.50.50
on the downstream interface I see
10.160.60.52 10.160.50.50 DHCP 346 DHCP Request -
Transaction ID 0x42cc161a
10.160.50.50 10.160.60.52 DHCP 346 DHCP ACK -
Transaction ID 0x42cc161a
10.160.60.49 10.160.60.52 DHCP 346 DHCP ACK -
Transaction ID 0x42cc161a
on the upstream interface I see
10.160.60.52 10.160.50.50 DHCP 346 DHCP Request -
Transaction ID 0x42cc161a
10.160.50.50 10.160.60.52 DHCP 346 DHCP ACK -
Transaction ID 0x42cc161a
10.160.50.49 10.160.50.50 DHCP 346 DHCP Request -
Transaction ID 0x42cc161a
10.160.50.50 10.160.60.49 DHCP 346 DHCP ACK -
Transaction ID 0x42cc161a
10.160.50.49 255.255.255.255 DHCP 346 DHCP NAK
- Transaction ID 0x42cc161a
It means first the dhcp request goes through the system and the answer handed
over backward as well.
But relay agent ip is not filled in the frame
But than the relay agent sends out a further unicast with his own ip as source
and with the relay agent ip set, towards the server . client mac address is
still correct.
The response is than forwarded to the client with the source ip from the relay
agent.
And finally I don't now why a NACK is send from the relay agent towards the
dhcp server as broadcast without any NACK from a client.
Any suggestions ?
Mit freundlichen Gr??en / With kind regards
Immo Wetzel
ADTRAN GmbH
Siemensallee 1
17489 Greifswald
Germany
Phone: +49 3834 5352 823
Mobile: +49 151 147 29 225
Skype: immo_wetzel_adtran
immo.wet...@adtran.com<mailto:immo.wet...@adtran.com> PGP-Fingerprint: 7313
7E88 4E19 AACF 45E9 E74D EFF7 0480 F4CF 6426
http://www.adtran.com<http://www.adtran.com/>
Sitz der Gesellschaft: Berlin / Registered office: Berlin
Registergericht: Berlin / Commercial registry: Amtsgericht Charlottenburg, HRB
135656 B
Gesch?ftsf?hrung / Managing Directors: Roger Shannon, James D. Wilson, Jr., Dr.
Eduard Scheiterer
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Message: 2
Date: Wed, 10 Jan 2018 19:33:18 +0000
From: IMMO WETZEL <immo.wet...@adtran.com>
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: dhcrelay listen at all ifs but should only on dedicated ifs
Message-ID:
<f5452071f098e84b91d98fde02860faaf147f...@ex-mb1.corp.adtran.com>
Content-Type: text/plain; charset=WINDOWS-1252
I?m running dhcrelay 4.3.5
My start line is
# dhcrelay -4 -d -iu br_TB104_TMN -id br_TB104_DUT 10.160.50.50
But dhcrelay is listen on all if?s like I specified nothing specific
Requesting: br_TB104_TMN as upstream: Y downstream: N
Requesting: br_TB104_DUT as upstream: N downstream: Y
Internet Systems Consortium DHCP Relay Agent 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/docker0/02:42:38:0e:27:5a
Sending on LPF/docker0/02:42:38:0e:27:5a
Listening on LPF/br_TB991_DUT/42:b9:9b:1e:1c:c9
Sending on LPF/br_TB991_DUT/42:b9:9b:1e:1c:c9
Listening on LPF/br_TB104_DUT/42:b9:9b:1e:1c:c9
Sending on LPF/br_TB104_DUT/42:b9:9b:1e:1c:c9
Listening on LPF/br_TB104_TMN/7a:59:88:45:a6:23
Sending on LPF/br_TB104_TMN/7a:59:88:45:a6:23
Listening on LPF/br_TB104_TMN/7a:59:88:45:a6:23
Sending on LPF/br_TB104_TMN/7a:59:88:45:a6:23
.
A lot more coming here
.
Sending on Socket/fallback
Discarding packet received on ens19.2002.4090 interface that has no IPv4
address assigned.
Dropping request received on br_TB102_DUT
Discarding packet received on ens20.1002 interface that has no IPv4 address
assigned.
.
Whats is wrong here with the start line ?
Mit freundlichen Gr??en / With kind regards
Immo Wetzel
ADTRAN GmbH
Siemensallee 1
17489 Greifswald
Germany
Phone: +49 3834 5352 823
Mobile: +49 151 147 29 225
Skype: immo_wetzel_adtran
immo.wet...@adtran.com PGP-Fingerprint: 7313 7E88 4E19 AACF 45E9 E74D EFF7
0480 F4CF 6426
http://www.adtran.com
Sitz der Gesellschaft: Berlin / Registered office: Berlin
Registergericht: Berlin / Commercial registry: Amtsgericht Charlottenburg, HRB
135656 B
Gesch?ftsf?hrung / Managing Directors: Roger Shannon, James D. Wilson, Jr., Dr.
Eduard Scheiterer
------------------------------
Message: 3
Date: Thu, 11 Jan 2018 00:27:41 +0100
From: Patrick Cervicek
<patr...@freifunk-stuttgart.spamtrap.hs-esslingen.de>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: relay agent dhcrelay goes crazy
Message-ID:
<6ae6eff1-1b13-44e0-a9ae-6574386ed...@freifunk-stuttgart.spamtrap.hs-esslingen.de>
Content-Type: text/plain; charset="utf-8"
Do you have problems in your setup or are you just curios about the NACK?
Tcpdump traces would be nice. Could you please put them on a web server?
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Message: 4
Date: Thu, 11 Jan 2018 00:23:16 +0100
From: Patrick Cervicek
<patr...@freifunk-stuttgart.spamtrap.hs-esslingen.de>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: dhcrelay listen at all ifs but should only on dedicated
ifs
Message-ID:
<84ef98cf-1fb2-444f-be1c-8783e9736...@freifunk-stuttgart.spamtrap.hs-esslingen.de>
Content-Type: text/plain; charset="utf-8"
It looks like your bridge interface has no IP address
Please provide:
brctl show
ip addr
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