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<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Though
the docs aren’t indexed in the web search tool yet, JUNOS 5.5 adds the
ability to perform loose <span class=SpellE>uRPF</span> now.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>[<span
class=GramE>edit</span> <span class=SpellE>int</span> <name> unit 0 family
<span class=SpellE>inet</span>]<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>set</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> <span
class=SpellE>rpf</span>-check mode loose<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Watch
for wrapping…<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><a
href="http://www.juniper.net/techpubs/software/junos/junos55/swconfig55-interfaces/download/swconfig55-interfaces.pdf">http://www.juniper.net/techpubs/software/junos/junos55/swconfig55-interfaces/download/swconfig55-interfaces.pdf</a><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>--
<span class=SpellE><span class=GramE>steve</span></span><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Date:
</span></font><st1:date Month="10" Day="8" Year="2002"><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Tue,
8 Oct 2002</span></font></st1:date><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font><st1:time
Hour="12" Minute="29"><font size=2 face="Courier New"><span style='font-size:
10.0pt;font-family:"Courier New"'>12:29:48</span></font></st1:time><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
-0400<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>From:
</span></font><st1:PersonName><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>Jared Mauch</span></font></st1:PersonName><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
<jared@puck.Nether.net><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Subject:
Re: Who does source address validation? (<span class=GramE>was</span> Re:
what's that smell?)<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>On
</span></font><st1:date Month="10" Day="8" Year="2002"><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Tue,
Oct 08, 2002</span></font></st1:date><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> at </span></font><st1:time
Hour="10" Minute="15"><font size=2 face="Courier New"><span style='font-size:
10.0pt;font-family:"Courier New"'>10:15:28AM</span></font></st1:time><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
-0600, Danny McPherson wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
> "reachable-via any" means you're only going to drop the packet
if you<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
> don't have *ANY* route back to them. <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
What's a route?<span style='mso-spacerun:yes'> </span><span class=GramE>An
IP RIB instance?</span><span style='mso-spacerun:yes'> </span><span
class=GramE>A BGP Loc-RIB instance?</span><span style='mso-spacerun:yes'>
</span>An IGP LSDB<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
IP <span class=GramE>prefix</span> entry?<span style='mso-spacerun:yes'>
</span><span class=GramE>A BGP <span class=SpellE>Adj</span>-RIB-In instance?</span><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
I think you mean "if you don't have *ANY* **FIB** entry for the <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>> source address".</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
If I peer with two large providers on the same router and both <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
have prefix D.1 behind them and advertise the prefix to me, it's<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>likely</span> that only one of those two paths is going to
make it into <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>the</span> BGP Loc-RIB (and subsequently, the IP RIB then
FIB).<span style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
If I use ANY FIB entry as proof that it's a valid source then <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>that</span> only addresses RFC1918ish space and only suggest
that I <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>first</span> need to generate an invalid BGP route for the
prefix, then <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
spoof the packets.<span style='mso-spacerun:yes'> </span>This doesn't fix
spoofing with global IP<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>> addresses.</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
If I use only entries that occur in the RIB and associate them <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>with</span> the receiving interface and receive a packet with
an SA of <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
D.1 from the peer whose path wasn't installed in the BGP <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
Loc-RIB then I'll drop it.<span style='mso-spacerun:yes'> </span>(And
there's nothing broken with <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>this</span> configuration -- it's why we have routers with 1
million <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
BGP paths but only 150K routes/fib entries, as I'm sure you <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
know).<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
If you're going to do source address validation then you need <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>to</span> associated all potential valid paths for a given
prefix with <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>>
<span class=GramE>the</span> associated ingress interface, else it's mostly
useless.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><span
style='mso-tab-count:1'> </span>Yes, but if <span
class=SpellE>i</span> continue in my ideal situation of people<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>(<span
class=GramE>mostly</span>) filter their <span class=SpellE>bgp</span>
customers, so they won't announce the<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>1918 space, or similar.</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><span
style='mso-spacerun:yes'> </span><span class=GramE>even</span> the large
peers filter out each other<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>so</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
they don't pick up 1918 announcements.<span style='mso-spacerun:yes'>
</span>Plus people use Robs <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>"Secure
IOS Template" to drop extraneous <span class=SpellE>bgp</span>
announcements for<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>unregistered/unassigned</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
space (from IANA).<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><span
style='mso-tab-count:1'> </span>I'm not
purporting this as a solution to all problems on<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>the</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
internet, but if one walks before one runs this is a reasonable<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>step</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> in
the correct direction.<span style='mso-spacerun:yes'> </span><span
class=GramE>Or at least a nice <span class=SpellE>bandaid</span> (duct tape?)</span><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>to</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
help keep the network in a bit more sensible shape.<span
style='mso-spacerun:yes'> </span>And if everyone<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>did</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
it, it would help with the <span class=SpellE>orignal</span> problem/statistics
posted about<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>how</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
much 1918 space was hitting one specific root server.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><span
style='mso-tab-count:1'> </span>I am interested
in hearing other solutions to the problem<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>including</span></font></span><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
extra validations such as the above, but those aren't<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=SpellE><span class=GramE><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>avalable</span></font></span></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
today and what <span class=SpellE>i'm</span> suggesting is in the 12.0S and
12.1E<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>IOS images and <span class=SpellE>probally</span>
others.</span></font></span><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><span
style='mso-tab-count:1'> </span>- Jared<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>-
-- <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><st1:PersonName><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Jared
<span class=GramE>Mauch</span></span></font></st1:PersonName><span
class=GramE><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><span style='mso-spacerun:yes'> </span>|</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
<span class=SpellE>pgp</span> key available via finger from
jared@puck.nether.net<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>clue</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>++;<span
style='mso-spacerun:yes'> </span>| <a
href="http://puck.nether.net/~jared/">http://puck.nether.net/~jared/</a><span
style='mso-spacerun:yes'> </span>My statements are only mine.</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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