Running two SSIDs, one with WPA2 and one with WEP

Hi,
I have a WRT610N. 
How isolated are the two SSIDs that I can run?
I know one is running at 5GHz and the other at 2.4GHz.  I've given each an SSID and a different security policy:  I run "sensitive" stuff under WPA2, and I run the other for legacy hardware that supports only WEP (eg my son's Nintento DS).
But are these two keys to the same house, so to speak?  If someone cracks my WEP network, can they access the machines on the WPA network?  Or are they completely isolated?
Does this make sense?
Thanks for any enlightenment.
-- Mike 
Solved!
Go to Solution.

Yes, they are "two keys to the same house".   The "house" is your LAN.   If someone cracks your WEP, and wirelessly breaks into your router, then they have access to your LAN.   This would be like allowing a hacker to wire his computer directly to your router.   Being on your LAN, puts the hacker in a very good position to break into any other computer on your network.    Your WPA2 encryption does not give you any protection from someone who is already on your LAN.
The solution to your problem is to run two separate wireless routers:
modem  ----  router1  ---  router2
router1 is set to "Local IP address"  192.168.1.1 , WEP encryption , set "AP isolation" to "enabled" , (note: no printers on router1)
router2 is set to "Local IP address"  192.168.2.1 , WPA2 encryption, use a strong password (and not anything similar to the WEP password). 
modem is wired to Internet port of router1
LAN port of router1 is wired to Internet port of router2
The wireless 2.4 GHz channels on the two routers must be different, and are preferably at least 5 channels apart.  Usually channels 1, 6, or 11 work best. 
With the above two router setup, the Internet port of router2 should protect you from any intruders on router1. 

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    Mar 31 15:28:53: --- last message repeated 7 times ---
    Mar 31 15:28:23 NAME kernel[0]:
    Mar 31 15:30:22 NAME kernel[0]:
    Mar 31 15:56:08 NAME kernel[0]:
    Mar 31 15:56:13: --- last message repeated 1 time ---
    Mar 31 15:56:13 NAME loginwindow[31]: in pam_sm_authenticate(): Failed to determine Kerberos principal name.
    Mar 31 15:56:16 NAME kernel[0]:
    Mar 31 15:56:46: --- last message repeated 8 times ---
    Mar 31 16:00:10 NAME kernel[0]:
    Mar 31 16:00:40: --- last message repeated 3 times ---
    Mar 31 16:00:44 NAME kernel[0]:
    Mar 31 16:01:14: --- last message repeated 5 times ---
    Mar 31 16:02:36 NAME kernel[0]:
    Mar 31 16:03:06: --- last message repeated 9 times ---
    Mar 31 16:03:22 NAME kernel[0]:
    Mar 31 16:10:31 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
    Mar 31 16:17:50 localhost DirectoryService[15]: Improper shutdown detected
    Mar 31 16:17:54 localhost fseventsd[33]: event logs in /.fseventsd out of sync with volume.  destroying old logs. (707133 444 707763)
    Mar 31 16:17:54 localhost bootlog[41]: BOOT_TIME: 1364713830 0
    Mar 31 16:17:58 localhost fseventsd[33]: log dir: /.fseventsd getting new uuid: NUMBER
    Mar 31 16:17:58 localhost blued[42]: Apple Bluetooth daemon started
    Mar 31 16:18:02 localhost mDNSResponder[28]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
    Mar 31 16:18:03 localhost com.apple.usbmuxd[21]: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
    Mar 31 16:18:04 localhost configd[13]: bootp_session_transmit: bpf_write(en1) failed: Network is down (50)
    Mar 31 16:18:04 localhost configd[13]: DHCP en1: INIT transmit failed
    Mar 31 16:18:04 localhost configd[13]: network configuration changed.
    Mar 31 16:18:04 NAME configd[13]: setting hostname to "NAME.local"
    Mar 31 16:18:04 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[29]: Login Window Application Started
    Mar 31 16:18:04 NAME configd[13]: network configuration changed.
    Mar 31 16:18:04 NAME mDNSResponder[28]: mDNSPlatformSetDNSConfig: Error: dns_configuration_copy returned NULL
    Mar 31 16:18:04 NAME configd[13]: network configuration changed.
    Mar 31 16:18:11 NAME mds[27]: (Normal) DiskStore: Creating index for /
    Mar 31 16:18:17 NAME loginwindow[29]: Login Window Started Security Agent
    Mar 31 16:18:18 NAME WindowServer[71]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:18:18 NAME com.apple.WindowServer[71]: Sun Mar 31 16:18:18 NAME.local WindowServer[71] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:18:29 NAME SecurityAgent[92]: NSSecureTextFieldCell detected a field editor ((null)) that is not a NSTextView subclass designed to work with the cell. Ignoring...
    Mar 31 16:18:30 NAME loginwindow[29]: Login Window - Returned from Security Agent
    Mar 31 16:18:30 NAME loginwindow[29]: USER_PROCESS: 29 console
    Mar 31 16:18:30 NAME com.apple.launchd.peruser.501[96] (com.divx.agent.postinstall): Unknown key: LimitToSessionType
    Mar 31 16:18:30 NAME com.apple.launchd.peruser.501[96] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
    Mar 31 16:18:36 NAME root[113]: /usr/libexec/ntpd-wrapper: scutil key State:/Network/Global/DNS not present after 30 seconds
    Mar 31 16:18:37 NAME root[130]: sntp options: a=2 v=1 e=0.100 E=5.000 P=2147483647.000
    Mar 31 16:18:37 NAME root[130]:     d=15 c=5 x=0 op=1 l=/var/run/sntp.pid f= time.apple.com
    Mar 31 16:18:37 NAME root[130]: sntp: getaddrinfo(hostname, ntp)  failed with nodename nor servname provided, or not known
    Mar 31 16:18:38 NAME-2 com.apple.launchd.peruser.501[96] (com.apple.mrt.uiagent[123]): Exited with exit code: 255
    Mar 31 16:18:38 NAME-2 com.apple.launchd.peruser.501[96] (com.apple.Kerberos.renew.plist[124]): Exited with exit code: 1
    Mar 31 16:19:55 NAME-2 XProtectUpdater[19]: NSURLConnection error: Error Domain=NSURLErrorDomain Code=-1009 UserInfo=0x100174890 "This computer’s Internet connection appears to be offline." Underlying Error=(Error Domain=kCFErrorDomainCFNetwork Code=-1009 UserInfo=0x1001744e0 "This computer’s Internet connection appears to be offline.")
    Mar 31 16:19:55 NAME com.apple.launchd[1] (com.apple.xprotectupdater[19]): Exited with exit code: 255
    Mar 31 16:22:04 NAME kextd[10]: updated kernel boot caches
    Mar 31 16:25:04 NAME Software Update[178]: SWU: scan found 0 products:
    Mar 31 16:25:05 NAME Software Update[178]: Error Domain=NSURLErrorDomain Code=-1009 UserInfo=0x10052e600 "This computer’s Internet connection appears to be offline." Underlying Error=(Error Domain=kCFErrorDomainCFNetwork Code=-1009 UserInfo=0x10052f760 "This computer’s Internet connection appears to be offline.")
    Mar 31 16:25:14 NAME com.apple.launchd[1] (com.apple.suhelperd[181]): Exited with exit code: 2
    Mar 31 16:25:18 NAME configd[13]: network configuration changed.
    Mar 31 16:26:17 NAME Software Update[188]: SWU: scan found 1 products:\n041-9605
    Mar 31 16:26:30 NAME ntpd[18]: time reset +1.140167 s
    Mar 31 16:26:57 NAME com.apple.launchd[1] (com.apple.suhelperd[190]): Exited with exit code: 2
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] ([0x0-0xf00f].com.apple.Console[142]): Exited: Killed
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] ([0x0-0x15015].com.apple.SoftwareUpdate[188]): Exited: Killed
    Mar 31 16:26:57 NAME com.apple.launchd.peruser.501[96] (com.apple.AirPortBaseStationAgent[126]): Exited: Killed
    Mar 31 16:26:57 NAME loginwindow[29]: DEAD_PROCESS: 29 console
    Mar 31 16:26:57 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[200]: Login Window Application Started
    Mar 31 16:26:58 NAME loginwindow[200]: USER_PROCESS: 200 console
    Mar 31 16:26:58 NAME WindowServer[203]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:26:58 NAME com.apple.WindowServer[203]: Sun Mar 31 16:26:58 NAME.local WindowServer[203] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:26:59 NAME Software Update[209]: Looking for products to install
    Mar 31 16:27:02 NAME Software Update[209]: Performing preflight
    Mar 31 16:27:02 NAME Software Update[209]: Preparing session
    Mar 31 16:27:02 NAME Software Update[209]: Starting session
    Mar 31 16:27:03 NAME Software Update[209]: PKG: extracting "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:03 NAME Software Update[209]: PKG: pre-flight scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:03 NAME Software Update[209]: PKG: pre-install scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:16 NAME Software Update[209]: REQ: moving files into place with shove
    Mar 31 16:27:17 NAME Software Update[209]: PKG: post-install scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: PKG: post-flight scripts for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: PKG: writing receipt for "com.apple.pkg.MacBookProSMCUpdate"
    Mar 31 16:27:17 NAME Software Update[209]: REQ: install succeeded
    Mar 31 16:27:18 NAME Software Update[209]: SWU: installing "MacBook Pro SMC Firmware Update, 1.6"
    Mar 31 16:27:20 NAME [0x0-0x1a01a].com.apple.SoftwareUpdate[209]: /: no supported helper partitions to update.
    Mar 31 16:27:20 NAME kextd[10]: updated kernel boot caches
    Mar 31 16:27:20 NAME Software Update[209]: kextcache returned 0
    Mar 31 16:27:20 NAME Software Update[209]: Running /sbin/reboot
    Mar 31 16:27:20 NAME reboot[242]: rebooted by Caithris
    Mar 31 16:27:20 NAME reboot[242]: BOOT_TIME: 1364714840 524942
    Mar 31 16:27:20 NAME mDNSResponder[28]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) stopping
    Mar 31 16:27:20 NAME DirectoryService[15]: BUG in libdispatch: 10K549 - 1960 - 0x10004004
    Mar 31 16:27:20 NAME WindowServer[203]: hidd died. Reestablishing connection.
    Mar 31 16:27:20 NAME WindowServer[203]: Unable to create event queue via hidd: (0x10000003)
    Mar 31 16:28:03 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
    Mar 31 16:29:52 localhost bootlog[47]: BOOT_TIME: 1364714882 0
    Mar 31 16:29:53 localhost mDNSResponder[34]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
    Mar 31 16:29:54 localhost configd[13]: network configuration changed.
    Mar 31 16:29:54 NAME configd[13]: setting hostname to "NAME.local"
    Mar 31 16:29:54 NAME com.apple.usbmuxd[27]: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
    Mar 31 16:29:56 NAME blued[17]: Apple Bluetooth daemon started
    Mar 31 16:29:57 NAME /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[35]: Login Window Application Started
    Mar 31 16:29:59 NAME configd[13]: network configuration changed.
    Mar 31 16:30:12: --- last message repeated 2 times ---
    Mar 31 16:30:12 NAME ntpd[24]: time reset +0.227711 s
    Mar 31 16:30:13 NAME loginwindow[35]: Login Window Started Security Agent
    Mar 31 16:30:14 NAME WindowServer[61]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:30:14 NAME com.apple.WindowServer[61]: Sun Mar 31 16:30:14 NAME.local WindowServer[61] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:30:21 NAME SecurityAgent[96]: NSSecureTextFieldCell detected a field editor ((null)) that is not a NSTextView subclass designed to work with the cell. Ignoring...
    Mar 31 16:30:22 NAME loginwindow[35]: Login Window - Returned from Security Agent
    Mar 31 16:30:22 NAME loginwindow[35]: USER_PROCESS: 35 console
    Mar 31 16:30:22 NAME com.apple.launchd.peruser.501[99] (com.divx.agent.postinstall): Unknown key: LimitToSessionType
    Mar 31 16:30:22 NAME com.apple.launchd.peruser.501[99] (com.apple.ReportCrash): Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
    Mar 31 16:30:32 NAME com.apple.launchd.peruser.501[99] (com.apple.mrt.uiagent[124]): Exited with exit code: 255
    Mar 31 16:30:35 NAME com.apple.launchd.peruser.501[99] (com.apple.Kerberos.renew.plist[125]): Exited with exit code: 1
    Mar 31 16:30:47 NAME mdworker[81]: (Error) SyncInfo: Catalog changed during searchfs too many times -- falling back to fsw search /
    Mar 31 16:36:05 NAME mdworker32[158]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:36:22 NAME mdworker32[161]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:36:29 NAME [0x0-0x10010].org.mozilla.firefox[149]: NOTE: child process received `Goodbye', closing down
    Mar 31 16:39:07 NAME mdworker[157]: Warning: unknown JFIF revision number 0.01
    Mar 31 16:39:22 NAME login[182]: USER_PROCESS: 182 ttys000
    Mar 31 16:40:34 NAME /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer[132]: No valid tickets, timing out
    Mar 31 16:40:35 NAME mdworker[157]: Error, could not create MachMessagePort for com.apple.AddressBook.abd
    Mar 31 16:40:37 NAME mdworker[157]: Unable to parse date (<XHTML-STRIPONREPLY>
    </XHTML-STRIPONREPLY>)
    Mar 31 16:40:38 NAME mdworker[157]: Unable to parse date ( S<XHTML-STRIPONREPLY>
    </XHTML-STRIPONREPLY>him to any)
    Mar 31 16:40:41: --- last message repeated 1 time ---
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 1
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 2
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 3
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 4
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 5
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 6
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 7
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 8
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 9
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 10
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 11
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 12
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 13
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 14
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 15
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 16
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 17
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 18
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 19
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 20
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 21
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 22
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 23
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 24
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 25
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:41 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 1
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 2
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 3
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 4
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 5
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 6
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 7
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 8
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 9
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 10
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 11
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 12
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 13
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 14
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 15
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 16
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 17
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 18
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 19
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 20
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 21
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 22
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 23
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 24
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 25
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char ^M for PropertyName in line 26
    Mar 31 16:40:43 NAME mdworker[157]: Invalid char \n for PropertyName in line 26
    Mar 31 16:41:27 NAME mdworker[157]: Corrupt JPEG data: 1 extraneous bytes before marker 0xd9
    Mar 31 16:41:27 NAME mdworker[157]: JPEG datastream contains no image
    Mar 31 16:41:33: --- last message repeated 1 time ---
    Mar 31 16:41:33 NAME login[182]: DEAD_PROCESS: 182 ttys000
    Mar 31 16:41:50 NAME mdworker[156]: iCal.mdimporter: could not parse ICS file: /Applications/Microsoft Office 2011/Office/OutlookCore.framework/Versions/14/Resources/en.lproj/Timezones.ics
    Mar 31 16:41:51 NAME mdworker32[204]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
    Mar 31 16:43:41 NAME [0x0-0x10010].org.mozilla.firefox[149]: NOTE: child process received `Goodbye', closing down
    Mar 31 17:07:10 NAME firefox[149]: -deltaZ is deprecated for NSEventTypeMagnify.  Please use -magnification.
    Thanks again- I mean it. It's lousy being stuck away from home when crazy thing happen to your main line of communication!
    -Caithris

    The gray screen with loading bar issue is a at boot fsck (file system check) that has discovered something wrong with your boot drive/partition and was attempting to fix it.
    OS X is booting but can't complete, so that means your hard drive is good, just likely has been either subjected to shock which damaged data on the platters, or bad sectors (the drive is dying if after fixing it, problems occurs again), or something messed something up in the file structure.
    Firefox is currently at 19.02, so it appears your background auto-update has not been occurring, which makes me suspect the machine's data is broken in some manner or you have malware on the machine blocking the updates.
    Your problems are multiple, in your case I advise a complete erase and install.
    1: If you have a backup of your user data on a external storage drive (not TimeMachine as it might be corrupted and compromised with malware it's just going to restore back) then your good, else you have to do this.
    Create a data recovery/undelete external boot drive
    Copy your data to a blank plain jane external storage drive as you want no executable files on it when you connect to the cleaned machine later.
    2: Once your data is safely copied (copy visible files manually and what you know is good, not folders that can contain invisible malware programs!) then disconnect the drive(s)
    3: Next assume all writeable media is contaminated with malware and treat as so. Even if you erased it.
    4: Stick in your 10.6 install disk and reboot holding the c or option key down. You want Disk Utility and you want to select the ENTIRE internal drive and MUST USE the Security Option > Zero All Data (unless your in the military then use 7x erase, do not use 35x as it will take weeks and is unnecessary)
    The Zero/7x erase will do two things, do a low level format and erradicate everything (including hidden stuff and deleted files) also will map off any failing sectors on the hard drive.
    5: Follow the procedure here to install 10.6
    How to erase and install Snow Leopard 10.6
    6: Reboot the machine twice, then once you set up the machine (using a alias of course and not allowing registration), use a secured network and IMMEDIATLY Software update to 10.6.8, if you can download the 10.6.8 Combo update on another secure machine to a (new) USB thumb drive and install it on the clean Mac, do that instead.
    WiFi security issues, at home and WiFi hotspots
    https://support.apple.com/kb/DL1399
    Still run Software update afterwards as Apple might not have fully updated the combo update yet.
    7: Once you machine is secure, download the free ClamXav and run a scan on the external storage drive with just your files, perhaps one or more PDF's or other files are not what they seem to be.
    8: Make sure to install fresh copies of software from original sources and not from rewriteable media, update them to be current. Malware can be hidden in copies of programs.
    9: Trash all your rewritable media, or use a Linux PC or Linux Mint in a virtual machine (VirtualBox) on another computer like Windows to scrub and reformat all the rewritable media before attaching them to the clean Mac. You have to make sure it's getting the entire media.
    10: Once your machine is set back up, then make clones and time and date them.
    Most commonly used backup methods
    If your still having problems with the machine, it's likley a failing hard drive and you will have to replace it and repeat the steps above pretty much.
    Really it's best to replace the drive in the interest of security.
    Install/upgrade RAM or storage drive in Mac's
    For performance of Snow Leopard, check out this tip
    For Snow Leopard Speed Freaks
    Your overseas, if your in a foriegn country you have to assume FinSpy is being installed on your machine (uses a older iTunes verison "update" to get on) or there is other tricks via the ISP to install something on your machine. So mix things up and don't stick any old USB you see laying around into your Mac.
    https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/

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