Re: Gratuitous ARP
"Tom Collins tom-lnEA/wrDJtNWk0Htik3J/[email protected] [rabbit-semi]" <[email protected]> Tue, 9 Jan 2018 15:23:34 -0800
| Newsgroups | gmane.comp.hardware.rabbit-semiconductor |
|---|---|
| Message-ID | <[email protected]> |
--Apple-Mail=_8A7531C5-C3C1-46FC-9D71-52F0E08019A7 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 So you don=E2=80=99t see an ARP on the network that the Rabbit might be res= ponding to. Does the target MAC vary, or is it always the same? Are you using DHCP? If so, could this event be happening around the time o= f a renewal? Does the TCP connection go to: - the default gateway for the network=20 - some other local device - a remote device (via the default gateway) Can you enable ARP_VERBOSE for a build, and see what sorts of ARP-related m= essages it=E2=80=99s spitting out right before failing? That might give a = clue as to what=E2=80=99s triggering the ARP request and decision to drop t= he connection (so TCP_VERBOSE or IP_VERBOSE or NET_VERBOSE might also provi= de context, but may also require too much space or slow the device down too= much). Feel free to email me directly with detailed information to debug the issue= .. If there=E2=80=99s a bug in the DC 9.62 TCP/IP stack, I=E2=80=99d like t= o get it fixed and pushed up to the GitHub repository. -Tom > On Jan 9, 2018, at 10:41 AM, Steve Trigero seecwriter-/[email protected] [rabbit-s= emi] <[email protected]> wrote: >=20 >=20 > I have an RCM3900 module that has a TCP connection with a host. The modul= e is receiving TCP packets at about a 1-second rate. So everything is hummi= ng along with the host sending TCP packets requesting status info, and modu= le responds with the data. After a some time, minutes to hours, of running= , the module issues 2-gratuitous ARP packets, about a second apart. And upo= n receiving the next TCP packet, the module responds by closing the connect= ion. >=20 > Both gratuitous ARP packets have the same ARP data: >=20 > Opcode: request (1) > Sender MAC address: 00:90:c2:f7:fd:36 > Sender IP address: 192.168.1.64 > Target MAC address: 3f:c7:01:00:b4:e5 > Target IP address: 192.168.1.64 >=20 > The target MAC doesn't appear to be valid. According to what I read, an = opcode of 1 is an ARP Probe or an ARP Announcement. If a probe, the sender = IP and target MAC are supposed to be set to 0, and the target IP set to the= IP in question (to see if it's taken), and if an announcement, the sender = IP and target IP are set to the same IP and the target MAC is set to 0 to a= nnounce that this NIC is using this IP address. The format of the above do= esn't fit either format. Could this be indicating an IP conflict?=20=20 > There is no response to either message. >=20 >=20 >=20 >=20 --Apple-Mail=_8A7531C5-C3C1-46FC-9D71-52F0E08019A7 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/htm= l4/strict.dtd"> <html> <head> </head> =20 <body style=3D"background-color: #fff;"> <span style=3D"display:none"> </span> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id=3D"ygrp-mlmsg" style=3D"position:relative;"> <div id=3D"ygrp-msg" style=3D"z-index: 1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id=3D"ygrp-text" > =20=20=20=20=20=20 =20=20=20=20=20=20 <p>So you don=E2=80=99t see an ARP on the network that the Rabbit mig= ht be responding to. Does the target MAC vary, or is it always the sa= me?<div class><br class></div><div class>Are you using DHCP? If so, c= ould this event be happening around the time of a renewal?</div><div class>= <br class></div><div class>Does the TCP connection go to:</div><div class>-= the default gateway for the network </div><div class>- some other loc= al device</div><div class>- a remote device (via the default gateway)</div>= <div class><div class><br class></div><div class>Can you enable ARP_VERBOSE= for a build, and see what sorts of ARP-related messages it=E2=80=99s spitt= ing out right before failing? That might give a clue as to what=E2=80= =99s triggering the ARP request and decision to drop the connection (so TCP= _VERBOSE or IP_VERBOSE or NET_VERBOSE might also provide context, but may a= lso require too much space or slow the device down too much).</div><div cla= ss><br class></div><div class>Feel free to email me directly with detailed = information to debug the issue. If there=E2=80=99s a bug in the DC 9.= 62 TCP/IP stack, I=E2=80=99d like to get it fixed and pushed up to the GitH= ub repository.</div><div class><br class><div class> <span class=3D"Apple-style-span" style=3D"border-collapse: separate;"><div = class>-Tom</div><br class=3D"Apple-interchange-newline"></span> </div> <br class><div><blockquote type=3D"cite" class><div class>On Jan 9, 2018, a= t 10:41 AM, Steve Trigero <a href=3D"mailto:seecwriter-/[email protected]" class>see= cwriter-/[email protected]</a> [rabbit-semi] <<a href=3D"mailto:rabbit-semi@yahoo= groups.com" class>[email protected]</a>> wrote:</div><br class= =3D"Apple-interchange-newline"><div class><div id=3D"ygrp-mlmsg" style=3D"f= ont-size: 13px;font-family: Arial, helvetica, clean, sans-serif;font-style:= normal;font-weight: normal;letter-spacing: normal;text-align: start;text-i= ndent: 0px;text-transform: none;white-space: normal;word-spacing: 0px;" cla= ss><div id=3D"ygrp-msg" class><div id=3D"ygrp-text" style=3D"font-family: G= eorgia;" class><div style=3D"margin: 0px 0px 1em;" class><br class=3D"webki= t-block-placeholder"></div><div style=3D"font-family: 'times new roman', 'n= ew york', times, serif;font-size: 16px;" class><div class>I have an RCM3900= module that has a TCP connection with a host. The module is receiving TCP = packets at about a 1-second rate. So everything is humming along with the h= ost sending TCP packets requesting status info, and module responds with th= e data. After a some time, minutes to hours, of running, the mod= ule issues 2-gratuitous ARP packets, about a second apart. And upon receivi= ng the next TCP packet, the module responds by closing the connection.</div= ><div class><br class></div><div class>Both gratuitous ARP packets have the= same ARP data:</div><div class><br class></div><div class>Opcode: request = (1)</div><div class>Sender MAC address: 00:90:c2:f7:fd:36</div><div class>S= ender IP address: 192.168.1.64</div><div clas= s>Target MAC address: 3f:c7:01:00:b4:e5</div><div class>Target IP address:&= nbsp; 192.168.1.64</div><div class><br class>= </div><div class>The target MAC doesn't appear to be valid. According= to what I read, an opcode of 1 is an ARP Probe or an ARP Announcement.&nbs= p;If a probe, the sender IP and target MAC are supposed to be set to 0, and= the target IP set to the IP in question (to see if it's taken), and if an = announcement, the sender IP and target IP are set to the same IP and the ta= rget MAC is set to 0 to announce that this NIC is using this IP address.&nb= sp; The format of the above doesn't fit either format. Could thi= s be indicating an IP conflict? <span class=3D"Apple-converted-sp= ace"> </span></div><div class>There is no response to either message.<= /div><div class><br class></div><div class><br class></div></div><div style= =3D"margin: 0px 0px 1em;" class><br class=3D"webkit-block-placeholder"></di= v></div><div style=3D"color: rgb(255, 255, 255);height: 0px;" class></div><= /div></div></div></blockquote></div><br class></div></div></p> </div> =20=20=20=20=20 <!--~-|**|PrettyHtmlStart|**|-~--> <div style=3D"color: #fff; height: 0;">__._,_.___</div> =20=20=20=20=20=20=20=20=20=20 =20=20 =20 =20=20=20=20 <div style=3D"clear:both"> </div> <div id=3D"fromDMARC" style=3D"margin-top: 10px;"> <hr style=3D"height:2px ; border-width:0; color:#E3E3E3; background= -color:#E3E3E3;"> Posted by: Tom Collins <tom-lnEA/wrDJtNWk0Htik3J/[email protected]> <hr style=3D= "height:2px ; border-width:0; color:#E3E3E3; background-color:#E3E3E3;"> </div> <div style=3D"clear:both"> </div> <table cellspacing=3D4px style=3D"margin-top: 10px; margin-bottom: 10px= ; color: #2D50FD;"> <tbody> <tr> <td style=3D"font-size: 12px; font-family: arial; font-weight: bo= ld; padding: 7px 5px 5px;" > <a style=3D"text-decoration: none; color: #2D50FD= " href=3D"https://groups.yahoo.com/neo/groups/rabbit-semi/conversations/mes= sages/42485;_ylc=3DX3oDMTJxcG9qZmtyBF9TAzk3MzU5NzE0BGdycElkAzIzMDczMTYEZ3Jw= c3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzQyNDg1BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTUxNTU= 0MDIyNQ--?act=3Dreply&messageNum=3D42485">Reply via web post</a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;" > <a href=3D"mailto:tom-lnEA/wrDJtNWk0Htik3J/[email protected]?subject=3DRe%3A%20%5Brabbit-= semi%5D%20Gratuitous%20ARP" style=3D"text-decoration: none; color: #2D50FD;= "> Reply to sender </a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;"> <a href=3D"mailto:[email protected]?subject=3DRe%3A%2= 0%5Brabbit-semi%5D%20Gratuitous%20ARP" style=3D"text-decoration: none; colo= r: #2D50FD"> Reply to group </a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;" > <a href=3D"https://groups.yahoo.com/neo/groups/rabbit-semi/conv= ersations/newtopic;_ylc=3DX3oDMTJlamMzamNzBF9TAzk3MzU5NzE0BGdycElkAzIzMDczM= TYEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTUxNTU0MDIyNQ--= " style=3D"text-decoration: none; color: #2D50FD">Start a New Topic</a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;color: #2D50FD;" > <a href=3D"https://groups.yahoo.com/neo/groups/= rabbit-semi/conversations/topics/42484;_ylc=3DX3oDMTM2M3VpanBjBF9TAzk3MzU5N= zE0BGdycElkAzIzMDczMTYEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzQyNDg1BHNlYwNmdHIE= c2xrA3Z0cGMEc3RpbWUDMTUxNTU0MDIyNQR0cGNJZAM0MjQ4NA--" style=3D"text-decorat= ion: none; color: #2D50FD;">Messages in this topic</a> (2) </td> </tr> </tbody> </table> =20=20=20=20=20=20=20=20 <div id=3D"megaphoneModule"> <hr style=3D"height:2px ; border-width:0; color:#E3E3E3; backgr= ound-color:#E3E3E3;"> <div> <div class=3D"stream" style=3D"margin-bottom:10px;"> <div style=3D"background-color:white;"> <div class=3D"sn-img" style=3D"display:inline;"><img name=3D"tn= _file" style=3D"padding:0px 10px;vertical-align:top;margin-top:5px;" src=3D= "https://s.yimg.com/ru/static/images/yg/img/megaphone/1464031581_phpFA8bON"= height=3D"82" width=3D"82"></div> <div class=3D"mod-txt" style=3D"display:inline-block;"> <a rel=3D"nofollow" name=3D"sub_url" target=3D"_blank" href= =3D"https://yho.com/1wwmgg" style=3D"color:#0000FF;display:block;margin-lef= t:5px;text-decoration:none;"><span style=3D"font-size:15px;">Have you tried= the highest rated email app?</span></a> <div style=3D"max-width:530px;padding:2px 5px;">With 4.5 st= ars in iTunes, the Yahoo Mail app is the highest rated email app on the mar= ket. 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