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S  6м _P   P*    6 _   R*  H  0޽h ? 3380___PPT10.T }  $(  r  S tP  r  S t0 X@  H  0޽h ? 33___PPT10i.+D=' = @B +U"    x) (  x" x s * ,$D  0r x S \Qt`  Q  x S Qt `P<$ 0 Q R x s *`R x s *` R x s *` x 0 q` @Policy(2 x 00  @Static(2  x 0 ' p ADynamic(2  x # BC`DEFAA` @h,@  P   x 0=@ @ Generation 2   x 3 BC`DEF` @h,@   `  x 0A  SError Checking and Deployment 2 x s *E\ ,$D 0 r rancid/rcc - FIREMAN/Lumeta -2 x s *I@0 ,$D 0 , ping - traceroute - &  -2  x s *M ` ,$@ 0 MIndependent analyses!(2B x 6DP  ,$D  0B x 6D  ,$@ 0H x 0޽h ? 33d\___PPT10<.'+?8D0' = @B D' = @BA?%,( < +O%,( < +Da' =%(%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x#%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x#G%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*xGp%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(DY' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(++0+x ++0+x ++0+x ++0+x +   @P(  Px P c $,t`   r P S t `    P s * p,$D 0 s-Idea: These analyses should inform each other*.(2)k P s *   |$D 0H@___PPT9" Two studies Routing Firewalls> (2(2 8XH P 0޽h ? 33\T___PPT104.#+kdD' = @B DS' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*P%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*P%(+p+0+P ++0+P +     P (  ~  s * |t`  |   0|P` 2  & a glitch at a small ISP& triggered a major outage in Internet access across the country. The problem started when MAI Network Services...passed bad router information from one of its customers onto Sprint. -- news.com, April 25, 1997  Microsoft's websites were offline for up to 23 hours...because of a [router] misconfiguration& it took nearly a day to determine what was wrong and undo the changes. -- wired.com, January 25, 2001  WorldCom Inc& suffered a widespread outage on its Internet backbone that affected roughly 20 percent of its U.S. customer base. The network problems& affected millions of computer users worldwide. A spokeswoman attributed the outage to "a route table issue." -- cnn.com, October 3, 2002 "A number of Covad customers went out from 5pm today due to, supposedly, a DDOS (distributed denial of service attack) on a key Level3 data center, which later was described as a route leak (misconfiguration). -- dslreports.com, February 23, 2004 'M;J& (# .<U 0H  0޽h ? 33___PPT10i. iN+D=' = @B +      9 (  r  S &|t`  |   s *'|tS" ` ` |   0(|  ` }/Idea: Analyze configuration before deployment 203 F 0    I "  N))?"6@ NNN?N`    0-| 0  C Configure  F  0?|p  S Detect Faults* F   0,B|   @DeployFB   ZD))?"0@NNN?N0 p B   ZD))?"0@NNN?N     HhF| ))?"6@ NNN?N0 0  =rcc(2   H|I| ))?"6@ NNN?N G  i1Many faults can be detected with static analysis.2(22H  0޽h ? 33___PPT10i.\'+D=' = @B +k  z (  ~  s *S|t`  | T  0PT|  That s wicked! -- Nicolas Strina, ip-man.net  Thanks again for a great tool. -- Paul Piecuch, IT Manager  ...good to finally see more coverage of routing as distributed programming. From my experience, the principles of software engineering eliminate a vast majority of errors. -- Joe Provo, rcn.com  I find your approach useful, it is really not fun (but critical for the health of the network) to keep track of the inconsistencies among different routers& a configuration verifier like yours can give the operator a degree of confidence that the sky won't fall on his head real soon now. -- Arnaud Le Tallanter, clara.nete+ 2"3d8&"H  0޽h ? 33___PPT10i. y+D=' = @B +P  g_0(  r  S Tl|t`  | r  S (m|t `  |   0pn|  0  k#Two problems Detection Localization,  H  0޽h ? 33___PPT10i.bpW+D=' = @B +5   :2@(  r  S w|t`  | r  S x|t |   0A?r  ,$@ 0  0A?  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DocumentLibraryFormDocumentLibraryFormDocumentLibraryForm print.com/2018-11-21T15:59:05Z2000-01-01T00:00:00Z _ Nick FeamsterNick Feamster  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmopqrstuvwxyz{|}~Root EntrydO)'5L@PicturesCurrent UserBGSummaryInformation( PowerPoint Document(nDocumentSummaryInformation80 MsoDataStore '5L'5LSMF3HXE5CGPQ==2'5L'5L :j    x63*;H01234569`$$$b$Cs tU*JWcb$ЈY \8/Q Dcb$MpJy88b$ 4>VaM_O{xceGb$76H]'3քU 0AA0 @wʚ;ʚ;g4DdDdPz[ 0ppp@ <4dddd| 0Q <4BdBd|< 080___PPT10 ? -O  ="Enterprise Network Troubleshooting##qNick Feamster Georgia Tech (joint with Russ Clark, Yiyi Huang, Anukool Lakhina, Manas Khadilkar, Aditi Thanekar)6rZ  W4 #Three Disjoint Views of the Network$$$Policy: The operator s  wish list Static: What the configurations say Dynamic: The behavior that users witness rt  A Closer LookdProactive analysis Fault avoidance Policy conformance Reactive diagnosis Correcting network faults Detection Localization Active and passive measurements Need user s perspective$8  $ 8*!Catastrophic Configuration Faults )%Case 1: Network-Wide Routing Analysis&&$(Proactive routing configuration analysis ) +%Operators Find Static Analysis Useful&&$ ,Yes, but Surprises Happen!Link failures Node failures Traffic volumes shift Network devices  wedged & -#Detection: Analyze Routing Dynamics$$$)Idea: Routers exhibit correlated behavior.*.Detection Three Types of Events:Single-router bursts Correlated bursts Multi-router bursts/"Localization: Joint Dynamic/StaticWhich routers are  border routers for that burst Topological properties of routers in the burstCase 2: FirewallsGeorgia Tech Campus Network Research and Administrative Network 180 buildings 130+ firewalls 1700+ switches 55000+ ports Problem: Availability/Reachability Flux in firewall, router, switch configurations No common authority over changes madehZ^Z#ZVZ^V W&Specific Focus: Firewall Configuration''$ Difficult to understand and audit configs Subject to continual modifications Roughly 1-2 touches per day Federated policy, distributed dependencies Each department has independent policies Local changes may affect global behaviordN+RN+R 0(Immediate) Open IssuesReachability and reliability of controller Service-level probes Diagnostic tools != Service-level  Happiness Policy conformance6A/A/ w/8  r.?  0Z  !"#$%&'()*+,-./123456789:;<=>?@APCEFGIJKMNOQRTVWXOh+'0 hp   Slide 1Nick FeamsteroickNick Feamstero187Microsoft PowerPointP@PIl@x@ 4;G g  E+  -- @ !--'@Arial-. $2 Enterprise Network JD%>+D+>>P>#YD+=."System-@Arial-. 2 CTroubleshootingC+DDD>>DDD%CD.-@Arial-. 2  Nick Feamstern@11611O11#.-@Arial-. 2   Georgia Tech=++++/+'+.-@Arial-. +2 p(joint with Russ Clark, %%/%0%!"0%!.-@Arial-.  2 pYiyi-!.-@Arial-. 2 pHuang,0%%%%.-@Arial-. 2 Anukoolr-%%"%%.-@Arial-. 2 Lakhinar%$"%%%.-@Arial-.  2 , .-@Arial-. 2 Manasn7%%%!.-@Arial-. 2  Khadilkare-%%%"%.-@Arial-.  2 , .-@Arial-. 2 *Aditin-%.-@Arial-. 2 Thanekar)%%%%"%.-@Arial-.  2 ).-U