Troubleshooting WLAN
Contents
1. 9o Aerohnive NETWORKS Iroupleshooting WLANS Tips ana tricks with practical examples by Gregor Vucajnk Knowledge services at Aerohive Networks email gvucajnk at aerohive com twitter GregorVucajnk 9o Aerohnive NETWORKS Get atree Aerohive AP management General International Freeval AP webinar page ntto Www aerohive com news events international webinars Hegistration page of the event held in Dutch language ntto info aerohive com June simplitied wireless Registration Landing Page NL htm Aeronive NETWORKS roubleshooting is more of an art form than exact science he Internet 9o Aerohnive NETWORKS AGENDA roubleshooting strategy Basic troubleshooting methodology Practical examples with commentary 9o Aerohnive ETWORKS 1 TROUBLESHOOTING STRATEGY Aeronive h eo Aerohive NETWORKS N Dilbert 40 years of age generalist Babysits the rest of the IT team usually junior members r Source www dilbert com 9o Aerohnive ETWORKS 3 Basic roubleshooting methodology Aerohive NETWORKS A A dentifying the issue Recreate problem Locate and isolate the cause m N S E Formulate a plan of solving the problem A N B Implement the plan lest to very the problem2. Length Info 11164 2820 8610 HawkingT_33 33 65 Aerohive_6b f7 15 802 11 54 Disassociate SN 2152 FN 0 Flags 9o Aerohnive NETWORKS 4 way handshake Process by the source key material is turned in encryption material to encrypt our communication It is done for EVERY WPA 2 association and reasocciation there is a slight difference when using 802 1 1r Directly follows association phase tor WPA 2 Personal Follows full EAP authentication for WPA 2 Enterprise Consists of four unicast frames Only upon successfully completing the 4 way handshake is the traffic from the client device allowed to the network past the AP Aeronive NETWORKS PMK Is known Generate SNonce Derive PTK Install PTK and GTK Message 3 EAPOL Ke Message 1 EAPOL Key ANonce Message 2 EAPOL Key Snonce MIC Message 4 EAPOL Key MIC Install PTK MIC Encrypted GTK PMK Is known Generate ANonce Derive PTK Generate GIK Install PTK and GTK Aerohive NETWORKS N 4 way handshake After MeSSage 4 4 4 is sent gt It becomes a network issue Check DHCP DNS FW VLANs etc Aerohive U uu supplicant Authenticator Authentication SW on client dev Access Point Server RADIUS 802 11 association EAPoL start EAP request identity RADIUS access request EAP response identity RADIUS access challenge EAP request c
3. is resolved A E CAI Document tne problem and tne solution e Provide feedback to user 3o PA Aerohive EIWORKS 00 3 Practical examples Aerohive NETWORKS 802 11 passive discove e Client devices can learn about the beacon frames Beacor Services 1 Wm Wlan fc type subtype eq 8 NETWORKS Aerohive wlan fc type_subtype eq 5 Aerohive NETWORKS N 4 2 11 autnentication e 802 11 authentication should not be confused Me authentication It is a simple two irani NE AMEN ine eno client device and tne it DI Je device see Aerohive NETWORKS Aerohive NETWORKS 802 11 8 e Client dew wlan fc type_subtype eq 5 eo Aerohive NETWORKS Additional management frames Reassociation request wlan fc type_subtype eg 2 already a part of ESS and roaming to new AP e Reassociation reponse wlan fc type subtype eq 3 similar to association but when roaming within ESS e Diassociation wlan fc type_subtype eq 10 used in roaming to terminate connection Deauthentication wlan fc type subtype eq 12 sent when all communication is terminated le when the AP Is rebooting File Edit View Go Capture Analyze Statistics Telephony Tools Internals Help Mi 7 216 ER 000 HERAB Filter wlan fc type_subtype eq 10 Expression Clear Apply Save Mo Time Source Destination Protocol
4. hallenge RADIUS access request AP response hashed response RADIUS access accept PMK Access Granted 7 o rohive Ae KS IWOR E N nts ing thoug S Clo ney md ative 7521 Be na thin y eve d break an lab a te a Cre e 9 TWORK E N W W
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