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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'>May I add that having your official router sending RA with a
high priority will already help.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'>If using Cisco switches, then you can use an Port ACL or even
the RA guard (both available on most recent switches with the software release
of Summer 2010).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'>interface FastEthernet3/13 <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> switchport mode access <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> ipv6 traffic-filter ACCESS_PORT in<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> access-group mode prefer port <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>ipv6
access-list ACCESS_PORT<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>
remark Block all traffic DHCP server -> client<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>
deny udp any eq 547 any eq 546<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>
remark Block Router Advertisements<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>
deny icmp any any router-advertisement<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:windowtext'>
permit any any<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'>or<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'>interface FastEthernet3/13 <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> switchport mode access <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> ipv6 nd raguard <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Courier New";
color:windowtext'> access-group mode prefer port <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'>Hope this helps (I am sure that other vendor switches can
achieve the same function)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'>-éric<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";
color:#31849B'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>
ipv6-ops-bounces+evyncke=cisco.com@lists.cluenet.de
[mailto:ipv6-ops-bounces+evyncke=cisco.com@lists.cluenet.de] <b>On Behalf Of </b>Rod
James Bio<br>
<b>Sent:</b> mercredi 9 mars 2011 8:06<br>
<b>To:</b> IPv6 operators forum<br>
<b>Subject:</b> Unwanted RA on LAN<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hello,<br>
<br>
I've been seeing 2002:ca5a::/32 advertise on our LAN recently,
actually it's two /64 advertised by two machine. I was wondering if anybody had
any past experience on this? I would like to know what application or operating
system feature is causing this so I could disable it and remove this RA's on
our LAN. Already search Google about this but no luck in finding anything.
Below is the output of <i>ifconfig </i>on my workstation. Thank you.<o:p></o:p></p>
<pre><o:p> </o:p></pre><pre> inet6 addr: 2002:ca5a:9f36:4:216:eaff:fec5:ebc/64 Scope:Global<o:p></o:p></pre><pre> inet6 addr: 2002:ca5a:9f5a:9:216:eaff:fec5:ebc/64 Scope:Global<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Rod<o:p></o:p></pre><pre><o:p> </o:p></pre></div>
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