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The Cisco AnyConnect ActiveX control contains a buffer overflow vulnerability, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. Description Cisco AnyConnect is an SSL VPN solution that is commonly initiated through use of a web browser. The CERT Coordination Center at Carnegie Mellon University announced last week that Cisco AnyConnect 4.7.x and prior store session cookies insecurely in memory. CERT also reported similar VPN. Select Applications Cisco campus Preparation for working - Carnegie Mellon and click Connect. Select Advanced Instructions For Anyconnect it to ignore the VPN Usage - Computing check out our use the Cisco AnyConnect using a VPN connection, uses Virtual Private Network -anyconnect/download. Access from off example, CMU VPN and Vpn.
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Thisis a DRAFT document and may contain errors. It is provided as a short-term troubleshootingresource for DSL customers who are having difficulty using the Cisco VPNclient.
Thesesuggestions are in no particular order, and are numbered only for easier reference.
1. SciFinder users: use a “VPN – Library” certificate.
The instructions at http://www.cmu.edu/computing/documentation/VPN/vpn_client.html#step2describe two different networks that a certificate can be registered under:“VPN – General Users” and “VPN – Library”.
A VPN with a General Users certificate will route any traffic to a CMU addressthrough the VPN, but all other traffic will go through your ISP without usingVPN. This is ideal if you only use the VPN for accessing CMU IP-restricted webpages or for accessing Chemserv via file sharing rather than SFTP. TheSciFinder software accesses a non-CMU server, and that server checks to see if yoursource address is a CMU address before granting access. Because the server isa non-CMU address, it won’t go through the VPN if you use a General Usercertificate, and the source address will be on your ISP’s network and thusdenied access to the SciFinder database.
A VPN with a Library certificate will route all traffice through theVPN. This means requests to the SciFinder servers will appear to originatefrom a CMU address and be granted access.
If you’ve already configured VPN with the General Users certificate, you canregister, issue, download and import a new Library certificate, and modify theexisting TCP and UDP entries to use that certificate instead.
2. Install the latest version.
Version 4.8 for Windows and 4.9 for OS X were released to http://www.cmu.edu/myandrew/ on4/18/2006. The Mac version requires OS X 10.4.
3. Mac OS X clients – manually set MTU value.
The Cisco 4.9 VPN client for OS X has a known bug that causes it to ignorethe MTU (Maximum Transmission Unit size) value sent by Verizon’s network,preventing the VPN connection from being established. Until Cisco releases anewer version of the client which fixes the problem, the workaround is tomanually set the MTU value for your computer to 1400 by following the steps at http://docs.info.apple.com/article.html?artnum=303192. Be sure to change the settings for the adapter that you’re using (Ethernet orWireless). MTU changes to a wired Ethernet connection persist across reboots,but changes to wireless do not and need to be re-made after every reboot priorto making a VPN connection.
4. Default to ‘Connect with TCP’
The instructions at http://www.cmu.edu/computing/documentation/VPN/vpn_client.htmldefault to connecting with UDP, but in many cases connecting with UDP does notwork with DSL routers. TCP introduces a small amount of network overheadwhich can make it slower than UDP, but is more likely to work from home.
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5. Disable any 3rd party firewallsoftware, such as ZoneAlarm or Norton Security Suite.
6. Temporarily disable the Windows Firewall.
If VPN works when Windows Firewall is disabled, confirm that your settingsmatch what are outlined at http://www.cmu.edu/computing/documentation/VPN/vpn_client.html#firewall.
7. Try multiple times.
In a few cases it has been reported that the first click of ‘Connect to VPN’fails, but the 2nd or 3rd click, a second or two apart,succeeds. If it doesn’t connect by the 3rd attempt, subsequentattempts are not likely to succeed.
8. If this is a laptop, try establishing the VPNfrom on-campus.
If the same machine can establish a VPN from on-campus but not at home, thiswill assert that your VPN software and firewall settings are configured correctly,and the trouble is likely outside your computer, such as the DSL router.
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9. (Where possible…) Connect directly to the DSLmodem.
A pure DSL modem has one phone line input and only one Ethernet output. Home networks might then include a separate router which allows multiplecomputers to share the single IP address provided to the modem via NAT- NetworkAddress Translation. If your network setup has discrete modem and routercomponents, disconnect your router and attach the computer in question directlyto the modem. You may need to reboot both the modem and computer. Once you confirm that you have a working network connection (ie: can access webpages), try establishing the VPN. If it works, then the problem is likelywith the router, which might be fixable via a firmware update to the router orconfiguration changes to the router’s integrated webpage.
Many new DSL modems provided by Verizon now integrate the modem, router, NAT,and a firewall into the same physical device, in which case it is not possibleto connect directly to the modem.
10. Update DSL modem/router firmware.
Firmware is software embedded into the modem and acts as the modem’s operatingsystem. Firmware can be updated to fix bugs or add features. Inparticular, the NAT software built into DSL modems may have settings orbehaviors that interfere with VPN, which may be resolved with a firmwareupdate. How to update the firmware depends on the make and model of yourmodem. Contact your ISP for instructions on updating your modem’sfirmware.
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11. Configure DSL modem firewall settings.
Some DSL modems include a firewall which may interfere with VPN. Suchfirewalls can often be configured or disabled via the modem’s webadministration interface. The modem’s web address is the same as yourhome computer’s gateway address. On OSX, look for the gateway address inthe network system preferences. On Windows, go to the Start menu, Run,CMD, and in the command window run ipconfig/all. Then in a web browserenter that address. For example: http://192.168.1.1. If possible, try temporarily disabling the firewall entirely. If thatworks, you can try re-enabling the firewall with the following ports open: UDP62515, TCP 10000, UDP 4500, UDP 500.
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12. Request a modem-only solution.
If you only have one computer at home, and it’s attached via Ethernet (asopposed to wireless), your ISP may be able to provide you with a modem-only DSLmodem, as opposed to a modem that integrates router/NAT/firewall.
Tentative Schedule
The schedule is also available as an ical file that you can subscribe to.
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Lectures and projects can only be accessed by clients with a CMU IP address. CMU students who are off campus can use Cisco AnyConnect VPN to obtain a CMU IP. Most readings require that you have access to ACM or IEEE's digital library. You will automatically have access if you are using a client with a CMU IP.
| Lecture | Date | Lecturer | Topics | Required readings | Optional readings | Notes |
|---|---|---|---|---|---|---|
| 1 | Mon 08/31 | Greg | Overview and Flash SSD Operation [pdf] | Syllabus, Agrawal2008 | Hennessy2002, Harchol2000 | |
| 2 | Wed 09/02 | Greg and Brian | Flash SSD Operation and Lab 1 Walkthrough [pdf] | Agrawal2008 | He2017, Mogul2009, ArpaciDusseau2015 ch44 | Slides for the myFTL project are available here. Lab 1, Checkpoint 0 and Checkpoint 1 are released. |
| Mon 09/07 | Neither | No class (Labor Day) | ||||
| 3 | Wed 09/09 | George | Disk Drive Operation [pdf] | Ruemmler1994, Worthington1994 | Massiglia1986 ch2 1, Massiglia1986 ch2 2, Massiglia1986 ch12, ArpaciDusseau2015 ch37 | Read pages 2-1 to 2-20 from Massiglia_ch2_1, 2-38 to 2-52 from Massiglia_ch2_2, and 12-1 to 12-11 from Massiglia_ch12. |
| 4 | Mon 09/14 | George | Disk Drive Operation (cont'd) [pdf] | Ruemmler1994, Worthington1994 | Massiglia1986 ch2 1, Massiglia1986 ch2 2, Massiglia1986 ch12, ArpaciDusseau2015 ch37 | Read pages 2-1 to 2-20 from Massiglia_ch2_1, 2-38 to 2-52 from Massiglia_ch2_2, and 12-1 to 12-11 from Massiglia_ch12. |
| 5 | Wed 09/16 | George | File System Storage Layout [pdf] | McKusick1996 ch8, Lee2015 | Ren2013, Rodeh2013, ArpaciDusseau2015 ch40, ArpaciDusseau2015 ch43 | |
| 6 | Mon 09/21 | George | File System Organization [pdf] | Vahalia1995 ch8 | Giampaolo1998 ch2, ArpaciDusseau2015 ch39, ArpaciDusseau2015 ch40 | |
| 7 | Wed 09/23 | Greg | Caching and File System Integrity [pdf] | Ganger2000, Giampaolo1998 ch7 | ArpaciDusseau2015 ch42, Fryer2012 | |
| 8 | Mon 09/28 | George | Disk Array Organization [pdf] | Chen1994, Schroeder2007 | Schroeder2016, ArpaciDusseau2015 ch38 | |
| 9 | Wed 09/30 | George | Disk Array Systems [pdf] | Chen1994, Hetzler2011 | Greenan2010, Krioukov2008 | |
| 10 | Mon 10/05 | Rekha Pitchumani (Research Manager, Samsung) | The Many Futures of NAND Flash SSDs | |||
| 11 | Wed 10/07 | Tim Emami (Sr Technical Director, NetApp) | Great File Systems Can Adapt | Hitz1994, Maneas2020 | ||
| Mon 10/12 | Both | Catch-up lecture + Exam 1 Q&A | ||||
| Wed 10/14 | Both | Exam 1 [pdf] | Exam1 S04 Q, Exam1 F05 Q, Exam1 F06 Q, Exam1 S08 Q, Exam1 S09 Q, Exam1 S10 Q, Exam1 S11 Q, Exam1 S14 Q, Exam1 S15 Q, Exam1 F15 Q, Exam1 F16 Q, Exam1 F17 Q, Exam1 F18 Q, Exam1 F19 Q | Exam1 S04 A, Exam1 F05 A, Exam1 F06 A, Exam1 S08 A, Exam1 S09 A, Exam1 S10 A, Exam1 S11 A, Exam1 S12 A, Exam1 S13 A, Exam1 S14 A, Exam1 S15 A, Exam1 F15 A, Exam1 F16 A, Exam1 F17 A, Exam1 F18 A, Exam1 F19 A | Exam 1 covers all material up to and including the week before the exam, including the projects. Try taking the Practice exams without looking at the answers. | |
| 12 | Mon 10/19 | George | Distributed FS and NAS Interfaces [pdf] | McKusick1996 ch9 | Howard1988, ArpaciDusseau2015 ch47, ArpaciDusseau2015 ch48, ArpaciDusseau2015 ch49, RFC1813 | |
| 13 | Wed 10/21 | Greg & George | More Distributed FS and Multi-server Distributed FSs [pdf] | McKusick1996 ch9 | Howard1988, ArpaciDusseau2015 ch47, ArpaciDusseau2015 ch48, ArpaciDusseau2015 ch49, RFC1813 | Slides for the CloudFS project are available here. |
| 14 | Mon 10/26 | Greg | Extremely scalable storage [pdf] | Ghemawat2003, Chang2006 | Dean2004 | |
| 15 | Wed 10/28 | Greg | More multi-server Distributed File Systems [pdf] | McKusick1996 ch9 | Howard1988, ArpaciDusseau2015 ch47, ArpaciDusseau2015 ch48, ArpaciDusseau2015 ch49, RFC1813, Anderson1995 | Note the addition of Anderson1995 in the Optional Readings list. |
| 16 | Mon 11/02 | Greg | Reliability enchancement techniques [pdf] | Holland1994, Welch2008 | ||
| Wed 11/04 | Neither | No class | ||||
| 17 | Mon 11/09 | Larry Greenfield, Storage Group, Google | Evolution of Google FSs | Dean2013 | ||
| 18 | Wed 11/11 | George | Backup and data protection [pdf] | Keeton2004 | Amvrosiadis2016 | |
| 19 | Mon 11/16 | Greg and George | More Data Protection and Extremely Scalable Storage [pdf] | Chang2006 | Readings from Lectures 14 and 18 also apply here | |
| 20 | Wed 11/18 | Ayman Abouelwafa (HPE Fellow and Storage Division CTO) | Data Storage Past and Future | |||
| 21 | Mon 11/23 | Huaicheng Li, Parallel Data Lab | Ins and Outs of Storage Offloading using ARM SoCs [pdf] | Li2020 | Kanev2015, Ouyang2014, Koo2017 | |
| Wed 11/25 | Neither | No class (Thanksgiving) | ||||
| 22 | Mon 11/30 | Mike Kazar and Jeff Butler, Microsoft | Azure HPC Cache and vFXT [pdf] | Howard1988 | RFC1813 | Take a look at Azure HPC Cache and Avere vFXT for Azure. |
| 23 | Wed 12/02 | Wenguang Wang (Senior Staff Engineer, VMware) | vSAN, VDFS, and Their Cache Design [pdf] | |||
| Mon 12/07 | Both | Exam 2 Q&A | ||||
| Wed 12/09 | Both | Exam 2 [pdf] | Exam2 F05 Q, Exam2 S08 Q, Exam2 S09 Q, Exam2 S10 Q, Exam2 S11 Q, Exam2 S14 Q, Exam2 S15 Q, Exam2 F15 Q, Exam2 F16 Q, Exam2 F17 Q, Exam2 F18 Q, Exam2 F19 Q | Exam2 F05 A, Exam2 S08 A, Exam2 S09 A, Exam2 S10 A, Exam2 S11 A, Exam2 S12 A, Exam2 S13 A, Exam2 S14 A, Exam2 S15 A, Exam2 F15 A, Exam2 F16 A, Exam2 F17 A, Exam2 F18 Q, Exam2 F19 A | Exam 2 covers all material up to and including the week before the exam, including the projects. Try taking the Practice exams without looking at the answers. |