[100618] in North American Network Operators' Group
RE: BGP Peering and Prefix filterin Question
daemon@ATHENA.MIT.EDU (Paul Stewart)
Mon Oct 29 14:40:07 2007
Date: Mon, 29 Oct 2007 14:37:59 -0400
In-Reply-To: <CCD4153D830F584982521DFC986BFF310DA3F6B4@tgainf06.TGASolutions.local>
From: "Paul Stewart" <pstewart@nexicomgroup.net>
To: "Jim McBurnett" <jim@tgasolutions.com>, <nanog@nanog.org>
Errors-To: owner-nanog@merit.edu
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hi there...
Who would have the time to monitor this if it was a manual process? ;)
Personally, never heard of that but it may happen out there....
We use strict RADB filtering on 95% of our connections. Once a day, we
run a copy of IRRPT against a list of peered AS's and update the
prefix-lists
For transit, we just sanitize the routes (drop private space, drop small
subnets etc.)
Take care,
Paul
________________________________
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Jim McBurnett
Sent: Monday, October 29, 2007 2:15 PM
To: nanog@nanog.org
Subject: BGP Peering and Prefix filterin Question
Hello,
Recently I have been told that some ISP's are automatically or maybe
manually modifying their BGP inbound prefix listing after a network is
not advertised to them for a period of time.
So the questions I pose to the group:
1. Is this normal?
2. Can anyone share your policies?
3. Who does it?
4. How often?
5. Is it automagic? Or the dirty work slaved off to the junior
engineer in the corner somewhere?
a. I know you probably won't trust that junior engineer, but some
do....
Anyway just a little research after a small problem a customer recently
had.
Thanks,
Jim
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>hi there...</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>Who would have the time to monitor this if it wa=
s a manual
process? ;) </FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>Personally, never heard of that but it may happe=
n out
there....</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>We use strict RADB filtering on 95% of our
connections. Once a day, we run a copy of IRRPT against a list of p=
eered
AS's and update the prefix-lists</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>For transit, we just sanitize the routes (drop p=
rivate
space, drop small subnets etc.)</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>Take care,</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007><FONT face=
=3DArial
color=3D#0000ff size=3D2>Paul</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D971463118-29102007></SPAN> =
;</DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> owner-nanog@merit.edu
[mailto:owner-nanog@merit.edu] <B>On Behalf Of </B>Jim McBurnett<BR><B>Se=
nt:</B>
Monday, October 29, 2007 2:15 PM<BR><B>To:</B>
nanog@nanog.org<BR><B>Subject:</B> BGP Peering and Prefix filterin
Question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal>Hello,<o:p></o:p></P>
<P class=3DMsoNormal>Recently I have been told that some ISP’s are =
automatically
or maybe manually modifying their BGP inbound prefix listing after a netw=
ork is
not advertised to them for a period of time.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>So the questions I pose to the group:<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLi=
sts]><SPAN
style=3D"mso-list: Ignore">1.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>Is this normal?<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLi=
sts]><SPAN
style=3D"mso-list: Ignore">2.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>Can anyone share your policies?<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLi=
sts]><SPAN
style=3D"mso-list: Ignore">3.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>Who does it?<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLi=
sts]><SPAN
style=3D"mso-list: Ignore">4.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>How often?<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLi=
sts]><SPAN
style=3D"mso-list: Ignore">5.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>Is it automagic? Or the dirty work slaved off to =
the
junior engineer in the corner somewhere?<o:p></o:p></P>
<P class=3DMsoListParagraph
style=3D"MARGIN-LEFT: 1in; TEXT-INDENT: -0.25in; mso-list: l0 level2 lfo1=
"><![if !supportLists]><SPAN
style=3D"mso-list: Ignore">a.<SPAN
style=3D"FONT: 7pt 'Times New Roman'">  =
;
</SPAN></SPAN><![endif]>I know you probably won’t trust that junior=
engineer,
but some do….<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>Anyway just a little research after a small problem =
a
customer recently had.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>Thanks,<o:p></o:p></P>
<P class=3DMsoNormal>Jim<o:p></o:p></P></DIV></P>
<P> </P>
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ins
confidential and/or privileged material. If you received this in error, p=
lease
contact the sender immediately and then destroy this transmission, includ=
ing all
attachments, without copying, distributing or disclosing same. Thank
you."<BR></SPAN></FONT></SPAN></P></BODY></HTML>
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