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Actually, I meant I am using the same RavenUSB-Stick adapter for both traffic, NDN and IPV6/4.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Junxiao Shi <shijunxiao@email.arizona.edu><br>
<b>Sent:</b> Thursday, November 7, 2019 3:33 AM<br>
<b>To:</b> Aboodi Ahed Hussein Ali <aboodi@student.usm.my><br>
<b>Cc:</b> <nfd-dev@lists.cs.ucla.edu> <nfd-dev@lists.cs.ucla.edu><br>
<b>Subject:</b> Re: [Nfd-dev] Changing the MTU size</font>
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<div dir="auto">Hi Aboodi
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<div dir="auto">'ip link' can set MTU separately for each Ethernet adapter. You can set low MTU on the USB Ethernet adapter only, without affecting traffic on other adapters.</div>
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<div dir="auto">Yours, Junxiao</div>
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<div dir="ltr" class="x_gmail_attr">On Wed, Nov 6, 2019, 14:28 Aboodi Ahed Hussein Ali <<a href="mailto:aboodi@student.usm.my">aboodi@student.usm.my</a>> wrote:<br>
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Hi all,</div>
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Thank you for your replay Junxiao. </div>
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The "ip link" command works great when I set the MTU size even to 105 bytes. However, I would prefer to set the MTU within NDN/NFD only, I don't want to force 127/105 mtu to IPV6/4 packets, which I am still using parallel with NDN. I thought we can set NDN
packet size using the <i>nfdc </i>command (per face) or the <i>tlv.hpp</i> (general).</div>
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Just to clarify why I need that, I have connected my Ubuntu with RavenUSB-Stick which is flashed with the Contiki-based 6lowpan communication protocol (802.15.4). The
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RavenUSB-Stick</span> purports the OS to be an ethernet card and accepts the ethernet frames from the USB port, replace the frame header with 6lowpan header, and then sends it using 805.15.4 radio. It fragments the ethernet packet to 127 using the 6lowpan fragmentation
process because the MTU limit for 6lowpan is 127. However, NDN packets cannot be sent (packet ignored for wrong packet type...) using the 6lowpan Contiki code, thus, I modify the code to accept ethernet frame with NDN packet type (when it comes from the OS),
and ignore 6lowpan fragmentation as NDN has implemented that in the link-service of NDNLPv2. Therefore, my issue is to make sure that NDN, in my ubuntu,
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considers the 802.15.4 MTU limit and </span>fragments the NDN packet if bigger than 127bytes. How can I set the MTU for a specific face (e.g. ethernet multicast face) to 127/105? or How to set it generally for NDN/NFD?</div>
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I am a beginner here, please forgive if I sent to the<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"> wrong mailing list</span>.</div>
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Thank you,</div>
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Ahed</div>
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<div id="x_m_-6599525819319474114divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" target="_blank" rel="noreferrer">shijunxiao@email.arizona.edu</a>><br>
<b>Sent:</b> Wednesday, November 6, 2019 7:52 PM<br>
<b>To:</b> Aboodi Ahed Hussein Ali <<a href="mailto:aboodi@student.usm.my" target="_blank" rel="noreferrer">aboodi@student.usm.my</a>><br>
<b>Cc:</b> <a href="mailto:nfd-dev@lists.cs.ucla.edu" target="_blank" rel="noreferrer">
nfd-dev@lists.cs.ucla.edu</a> <<a href="mailto:nfd-dev@lists.cs.ucla.edu" target="_blank" rel="noreferrer">nfd-dev@lists.cs.ucla.edu</a>><br>
<b>Subject:</b> Re: [Nfd-dev] Changing the MTU size</font>
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<div dir="auto">Hi Aboodi</div>
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<div dir="auto">MTU of Ethernet faces is read from the kernel. You can use ‘ip link’ command to change it before starting NFD.</div>
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<div dir="auto">I doubt you can go as low as 127. IPv4 would stop working at that MTU.</div>
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<div dir="auto">Yours, Junxiao</div>
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<div dir="ltr">On Wed, Nov 6, 2019 at 04:05 Aboodi Ahed Hussein Ali <<a href="mailto:aboodi@student.usm.my" target="_blank" rel="noreferrer">aboodi@student.usm.my</a>> wrote:<br>
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Hi,</div>
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I am trying to change the MTU size for the ethernet multicast face (remote=ether://[01:00:5e:00:17:aa]) to 127 but I am not sure how to do that. </div>
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I have tried to change the MTU of the multicast face with the below command, but I got "<i>Error 406 when creating face: Cannot create multicast Ethernet faces</i>" </div>
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<i>The command: nfdc face create remote ether://[01:00:5e:00:17:aa] local dev://ens33 mtu 127</i></div>
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I have also tried to change the "MAX_NDN_PACKET_SIZE = 127" in the "~/<i>ndn-cxx/ndn-cxx/encoding/tlv.hpp</i>" but I get a fatal exception, "<i style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255)">encodes into 413 octets,
exceeding the implementation limit of 127 octets</i><span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255)">,</span> when I run the "<i>nfd-start</i>".</div>
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Could you please advise me on how to change it.</div>
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Thank you,</div>
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Ahed</div>
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