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© The Association of Independent Schools of NSW To block or not to block 5 IT Managers share their experiences.

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Presentation on theme: "© The Association of Independent Schools of NSW To block or not to block 5 IT Managers share their experiences."— Presentation transcript:

1 © The Association of Independent Schools of NSW To block or not to block 5 IT Managers share their experiences

2 © The Association of Independent Schools of NSW Knox Grammar School Mike Israel – IT Manager

3 © The Association of Independent Schools of NSW Network Topology

4 © The Association of Independent Schools of NSW Internal Network  Cisco Switches and Access Points  Using VLAN’s  Originally no wireless security  Wireless WPA-TKIP with PEAP authentication. When machine is joined to domain it is issued with a certificate to join the network

5 © The Association of Independent Schools of NSW Bandwidth Control Packeteer  Provides bandwidth control  Can monitor and control how bandwidth is being used eg. iTunes downloads, max total 5Mbps, any one connection <256kbps  Can designate slices of bandwidth to particular ports protocols  Can block programs and protocols eg, encrypted tunnelling over port 80

6 © The Association of Independent Schools of NSW ACL’s on core router to block student access to servers Using ACL’s Access Control Lists enable the control of certain VLAN’s to specified servers/addresses/ports/services

7 © The Association of Independent Schools of NSW Spam and Anti-virus Spam is detected, marked as spam and delivered to Junk mail folder via Exchange. ClamAV does initial filtering of malware. Trend Micro performs second pass on incoming mail. Symantec Client used on client machines Spam Assassin, Clam AV (free) Symantec Client Updates Trend Micro

8 © The Association of Independent Schools of NSW Filtering - ContentKeeper Can block all unmanaged sites to students which takes care of proxy bypass. Also blocks keyword searches on popular search engines, block protocols (backup to Packeteer) Firewall prevents access to certain IP address ranges on certain ports

9 © The Association of Independent Schools of NSW ContentKeeper Filtering Groups  Users default to general profile with filtering based on student needs  Staff identified through their login (LDAP) to more open filtering  Pages can be blocked/coached/time of day. All unmanaged sites blocked for students

10 © The Association of Independent Schools of NSW Web Access Policy  Technology Usage Policy published in school diary and condition to login. Also Year 7 sign when they take delivery of their school laptop  MySpace and Youtube blocked, Facebook OK  Streaming media is limited so as not to clog Internet access

11 © The Association of Independent Schools of NSW Mike Israel Knox Grammar School 7 Woodville Ave Wahroonga Phone (02) Fax (02) Contact Details

12 © The Association of Independent Schools of NSW Danebank Anglican School for Girls John Tuffs – IT Director

13 © The Association of Independent Schools of NSW Network History  < 2005 Microsoft ISA Firewall + DCHP/DNS with no filtering  2005 – 2008 ISONet HTTP & SMTP filtering ISA Firewall + DCHP/DNS  2008 Cisco ASA Firewall + SONAR filtering Windows server for DHCP/DNS

14 © The Association of Independent Schools of NSW Danebank Network Layout

15 © The Association of Independent Schools of NSW Internal Network  HP Procurve Switches  1 Management VLAN for Procurve Manager  1 VLAN for the rest  Wireless Access Points using only WEP & MAC security (ie no security)

16 © The Association of Independent Schools of NSW Antivirus / SPAM / Web Filtering  Symantec System Centre and local clients for AV  SPAM handled by Sonar Appliance – not using challenge option  Filtering handled by Sonar Appliance (Initial install and support provided by Accucom)

17 © The Association of Independent Schools of NSW Sonar Filtering Groups  IT Staff  General Staff / Teachers  Senior School (7-12)  Junior School (K-6)  Lunch Filter (7-12)

18 © The Association of Independent Schools of NSW Custom Block Message

19 © The Association of Independent Schools of NSW Web Access Policy  Internet Acceptable Use policy signed by students  All social networking is blocked  Youtube is blocked to students – teachers can show videos  Streaming media is blocked due to bandwidth constraints

20 © The Association of Independent Schools of NSW John Tuffs IT Director Park Rd Hurstville NSW 2220 Phone (02) Fax (02) Contact Details

21 © The Association of Independent Schools of NSW Security Workshop SCEGGS Darlinghurst

22 © The Association of Independent Schools of NSW Topology Overview

23 © The Association of Independent Schools of NSW ISOnet topology

24 © The Association of Independent Schools of NSW SCEGGS’ Topology

25 © The Association of Independent Schools of NSW ISOnet: Intrusion Detection  Two layers of Intrusion Prevention using  McAfee IntruShield and TippingPoint.  Both are set to blocking mode for all medium to high threats.  There have been 13,777,987 Exploits blocked…This week!  There have been 1,830,537 policy Violations blocked…This week!

26 © The Association of Independent Schools of NSW ISOnet: Denial of Service  Peakflow DDoS technology from Arbor Networks.  There have been 1,830,537 policy Violations blocked…This week!  Up to 60% of traffic bound for schools is blocked by ISONet as it is unsolicited. Schools only pay for what they use.

27 © The Association of Independent Schools of NSW ISOnet: Spam/Av  ISOnet uses a cluster of McAfee and IronPort AV/Spam/Content filter appliances.  Filters based on policies set by individual school  Actions taken by the filter is specified as part of the policy determined by the school  For staff – messages sent to This mailbox is searchable by staff through a proxy arrangement.  For students spam messages are dropped

28 © The Association of Independent Schools of NSW ISONet Policies  Real-time blackhole list (RBL) checking – Identifies whether the IP address is an open relay or spam organisation.  IP Reputation checking – Identifies whether an IP address has been known to send exploits, worms, trojans or sites known to be hacked.  Anti-spoofing verifications – Determines if sender is attempting to forge as an internal address.  All scanning modules listed in the attached document (AV checks, spam checks, content-filtering checks, anti-phishing checks, file filtering, etc.)  Integrity Analysis – Examine header, layout and organisation of the message.  Spam scoring - Positive and negative scoring of s based on known spam traits.  Bayesian Learning - Custom created spam signatures based on feedback system – false-positive and false-negative verification.  Blacklists and whitelists – customer based trusted and untrusted senders.

29 © The Association of Independent Schools of NSW From Outside: SCEGGS Policy SettingStatusSeverityConfiguration Detail (Action) Anti-spamEnabledMedium When spam identified: Refuse original data and return a rejection code Forward the original to Anti-virusEnabledHigh When identified: Attempt to clean If cleaning fails replace content with an HTML alert and quarantine the original Anti-PhishingEnabled When identified: Forward the original to CompliancyDisabled- Corrupt ContentEnabled When corrupt content detected: Replace the content with an HTML alert Encrypted ContentEnabled When encrypted content detected: Allow through File FilteringDisabled- HTML SettingsDisabled- Mail SettingsDisabled- Mail Size FilteringDisabled- When the message is larger than kilobytes: Refuse the original data and return a rejection code Deliver a notification to the sender Protected ContentEnabled- When protected content is detected: Allow through Enabled- When a denial of service protection limit is exceeded: Replace the content with an HTML alert Enabled- When signed content is detected: Allow changes to break signed Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through Enabled- When content identified: Allow through

30 © The Association of Independent Schools of NSW Ian Ralph IT Manager – SCEGGS Darlinghurst 215 Forbes St Darlinghurst NSW 2010 Phone (02) Fax (02) Web sceggs.nsw.edu.au Contact Details

31 © The Association of Independent Schools of NSW Arndell Anglican College Network Security Overview

32 © The Association of Independent Schools of NSW VLAN’s Low Level VLAN Map

33 © The Association of Independent Schools of NSW What’s Great About VLAN’s  Allows use of ACL’s  Segments Broadcast Traffic  More Devices

34 © The Association of Independent Schools of NSW How Does it Translate Into a Physical Layout?

35 © The Association of Independent Schools of NSW Content Filtering at Arndell  Blacklists - Various Categories Updated Regularly  Scanning of log’s regularly  Students summoned to explain actions  Culture has changed now that students know they will be caught if they do the wrong thing  Internet traffic is forced to content filter dependent on VLAN assignment

36 © The Association of Independent Schools of NSW Spam and Anti - Virus  Sophos Anti - Virus used across the network  Sophos plug - in for mail server  Spam filtered using Spam Assassin  Blacklist lookups like SORBS

37 © The Association of Independent Schools of NSW Rohan Smith Coordinator IT Services Arndell Anglican College 118 Wolseley Road Oakville NSW 2765 Phone: Fax: Website: Contact Details

38 © The Association of Independent Schools of NSW The King’s School Michael Eggenhuizen

39 © The Association of Independent Schools of NSW The School The King’s School – Some Statistics:  Anglican Church School  Established in 1832 (176 years)  300 acres in North Parramatta  K-12 Boys School with 1450 Students  400 Boarders  Multiple Residences on Property

40 © The Association of Independent Schools of NSW Internet Bandwidth Internet Connection Bandwidth:  2005 – 2.5Mb ADSL/ISDN  2006 – 10Mb Ethernet  2007 – 20Mb Ethernet  2008 – 50Mb Ethernet  2009 – 100Mb Ethernet  ISP – The Somerville Group

41 © The Association of Independent Schools of NSW Internet Access All Staff and Students have Access to:  YouTube, MySpace, FaceBook,...  Hotmail, Yahoo Mail, Gmail,...  MSN Messenger,...  Most if not all Web 2.0 Technologies  Changes to filtering (lead by ICT Services) provide staff and students with a real and relatively unrestricted learning experience

42 © The Association of Independent Schools of NSW Internet & Filtering Filtering is multi-layered:  Filtering Filtering  Internet FilteringInternet Filtering

43 © The Association of Independent Schools of NSW Network Box Weekly Activity (Incoming Average)  Spam (95.5%) - 485,647  Virus (1.5%) - 7,608  Delivered (3%) - 15,615  Total (100%) - 508,870

44 © The Association of Independent Schools of NSW Network Box Weekly Internet Activity (Average)  URL's Visited - 13,254,949  URL's Blocked due to Virus Activity - 71  URL's Blocked due to Policy Rules - 3,326  Threat Signature Updates  Internet Download (GB) – 398  Monthly Internet Download (TB) – 1.6

45 © The Association of Independent Schools of NSW Michael Eggenhuizen Director ICT PO Box 1 Parramatta NSW 2124 Phone (02) Fax (02) Contact Details


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