<div dir="ltr"><div><div>Hi.<br><br></div>I am not sure about your environment, but I had similar problem on our system.</div><div>We have a system with 2 Eth interfaces connected to internal on-board Micrel switch.<br></div><div>I am not sure if this has any similarity with your setup, but here is mine and it may</div><div>at least give you some ideas:</div><div><br></div><div>1. Unit1: DHCP client in VLAN 100.</div><div>2. Unit2: DHCP relay. This unit has 2 Eth Ports on internal switch.</div><div><br></div><div><span style="font-family:monospace,monospace">|Unit1 | |Unit2 |<br></span></div><div><span style="font-family:monospace,monospace">|br0.100|</span><span style="font-family:monospace,monospace"><span style="font-family:monospace,monospace"> --VLAN100--> |</span></span><span style="font-family:monospace,monospace"><span style="font-family:monospace,monospace"><span style="font-family:monospace,monospace">DHCP relay|--to DHCPs-><br></span></span></span></div><div><span style="font-family:monospace,monospace">|DHCPc | | |</span></div><div><br></div><div>The problem was, that the internal switch for the interface on Unit2 was accepting VLAN100 and</div><div>also untagged traffic. As soon as I disabled untagged traffic for that port in the switch on Unit2,</div><div>I did not get duplicated requests any more.</div><div><br></div><div>So, you should look for packets on your interfaces and find out which interfaces kernel is broadcasting</div><div>them to. Probably they "leak" to more than one interface you'd like to.<br></div><div><br></div><div>Hope it helps.<br></div><div><br></div><div>RegK<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 16, 2018 at 4:21 AM, IMMO WETZEL <span dir="ltr"><<a href="mailto:IMMO.WETZEL@adtran.com" target="_blank">IMMO.WETZEL@adtran.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="DE">
<div class="m_7272933383371461227WordSection1">
<p class="MsoNormal">HI<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span lang="EN-US">Why do I get duplicated request frames towards the dhcp server ?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">One as unicast from originator and one as unicast from the relay.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Do I have to do some filtering ?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">The dhcp relay is version 4.3.6 self compiled and running inside a docker container.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Routing is enabled between the IU and ID interfaces<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Start command dhcrelay -4 -d -iu ens18 -id br_TB102_TMN 10.160.5.2<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL"># route<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Kernel IP routing table<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Destination Gateway Genmask Flags Metric Ref Use Iface<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">default gateway 0.0.0.0 UG 0 0 0 ens18<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">10.160.8.0 0.0.0.0 255.255.254.0 U 0 0 0 ens18<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">10.160.50.16 0.0.0.0 255.255.255.240 U 0 0 0 br_TB102_TMN<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">#brctl show<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"># brctl show<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">bridge name bridge id STP enabled interfaces<u></u><u></u></span></p>
<p class="MsoNormal">br_TB102_DPU 8000.42b99b1e1cc9 no ens19.2002<u></u><u></u></p>
<p class="MsoNormal"> <wbr> <wbr> <wbr>
<span lang="EN-US">ens19.2002.4090<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">br_TB102_TMN <wbr> 8000.7a598845a623 no ens20.1002<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL">docker0 <wbr> 8000.0242380e275a no
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="PL"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="PL">#ip a<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">ip a<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet <a href="http://127.0.0.1/8" target="_blank">127.0.0.1/8</a> scope host lo<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 ::1/128 scope host <u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">2: ens18: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 36:78:14:96:53:13 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet <a href="http://10.160.8.83/23" target="_blank">10.160.8.83/23</a> brd 10.160.9.255 scope global ens18<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::3478:14ff:fe96:5313/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">3: ens19: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 42:b9:9b:1e:1c:c9 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::40b9:9bff:fe1e:1cc9/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">4: ens20: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 7a:59:88:45:a6:23 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::7859:88ff:fe45:a623/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">5: ens20.1002@ens20: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc noqueue master br_TB102_TMN state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 7a:59:88:45:a6:23 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::7859:88ff:fe45:a623/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">6: ens19.2002@ens19: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc noqueue master br_TB102_DPU state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 42:b9:9b:1e:1c:c9 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::40b9:9bff:fe1e:1cc9/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">7: br_TB102_DPU: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc noqueue state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 42:b9:9b:1e:1c:c9 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet <a href="http://10.160.60.17/28" target="_blank">10.160.60.17/28</a> brd 10.160.60.31 scope global br_TB102_DPU<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::40b9:9bff:fe1e:1cc9/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">8: br_TB102_TMN: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc noqueue state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 7a:59:88:45:a6:23 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet <a href="http://10.160.50.17/28" target="_blank">10.160.50.17/28</a> brd 10.160.50.31 scope global br_TB102_TMN<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::7859:88ff:fe45:a623/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">9: ens19.2002.4090@ens19.2002: <BROADCAST,MULTICAST,UP,LOWER_<wbr>UP> mtu 1500 qdisc noqueue master br_TB102_DPU state UP group default qlen 1000<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 42:b9:9b:1e:1c:c9 brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::40b9:9bff:fe1e:1cc9/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">10: docker0: <NO-CARRIER,BROADCAST,<wbr>MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> link/ether 02:42:38:0e:27:5a brd ff:ff:ff:ff:ff:ff<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet <a href="http://172.17.0.1/16" target="_blank">172.17.0.1/16</a> scope global docker0<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> inet6 fe80::42:38ff:fe0e:275a/64 scope link
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> valid_lft forever preferred_lft forever<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">pcap is available at:<u></u><u></u></span></p>
<p class="MsoNormal"><a href="https://turl.ca/semr" target="_blank"><span lang="EN-US">https://turl.ca/semr</span></a><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Mit freundlichen Grüßen / With kind regards<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Immo Wetzel<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">ADTRAN GmbH<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Siemensallee 1<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">17489 Greifswald<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Germany<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas">Phone: <a href="tel:+49%203834%205352823" value="+4938345352823" target="_blank">+49 3834 5352 823</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas">Mobile: <a href="tel:+49%201511%204729225" value="+4915114729225" target="_blank">+49 151 147 29 225</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas">Skype: immo_wetzel_adtran<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas" lang="EN-US"><a href="mailto:Immo.Wetzel@Adtran.com" target="_blank"><span style="font-family:"Times New Roman","serif";color:blue" lang="DE">Immo.Wetzel@Adtran.com</span></a></span><span style="font-size:10.0pt;font-family:Consolas">
PGP-Fingerprint: 7313 7E88 4E19 AACF 45E9 E74D EFF7 0480 F4CF 6426<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas" lang="EN-US"><a href="http://www.adtran.com/" target="_blank"><span style="font-family:"Times New Roman","serif";color:blue" lang="DE">http://www.adtran.com</span></a></span><span style="font-size:10.0pt;font-family:Consolas"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Consolas;color:#7f7f7f">Sitz der Gesellschaft: Berlin / Registered office: Berlin<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Consolas;color:#7f7f7f">Registergericht: Berlin / Commercial registry: Amtsgericht Charlottenburg, HRB 135656 B<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Consolas;color:#7f7f7f" lang="EN-US">Geschäftsführung / Managing Directors: Roger Shannon, James D. Wilson, Jr., Dr. Eduard Scheiterer</span><span><u></u><u></u></span></p>
<p class="MsoNormal"><u></u><u></u></p>
<p class="MsoNormal">This message has been classified <b>General Business</b> by <b>
IMMO WETZEL</b> on Montag, 15. Januar 2018 at 16:19:17.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
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