Best Practices With IP Security.
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1 Best Practices With IP Security Presented by Stuart Strong Presented by Stuart Strong
2
3 What are the threats? Know your enemy Network telescope research Current measurement of network events Represents at least 1/256 th of illegitimate traffic Among the visible events are various forms of flooding DoS attacks, infection of hosts by Internet worms, and network scanning. This work would not be possible without the cooperation of UCSD Network Operations and support from DARPA, NSF, Cisco Systems and Caida members.
4 What are the risks? Risk = threat x vulnerability x cost
5 Network vulnerability DoS attacks Change the source address To random IP address Or to a secondary target Scanning is used to find resources to attack
6 Who is attacked? These are locations of attacked computers 4 week average of source of backscatter dark traffic s=src_country&graphs_sing=map&counters_sing=packets×cales=672
7 Network configuration vulnerability Tracing route to customer uninet.net.mxuninet net mx [ ] over a maximum of 30 hops: 1 >>> ms 137 ms 137 ms wan-d uninet-ide.com.mx [ ] ms 141 ms 140 ms gw-bb-cun.cancun.com.mx [ ] ms 145 ms 137 ms noc.cancun.com.mx [ ] ms 157 ms 160 ms intercun-pya.cancun.com.mx [ ] ms 182 ms 197 ms ppp cancun.com.mx [ ] ms 201 ms 265 ms intercun-pya.cancun.com.mx [ ] ms 196 ms 210 ms ppp cancun.com.mx [ ] ms 201 ms 202 ms intercun-pya.cancun.com.mx [ ] ms 230 ms 209 ms ppp cancun.com.mx [ ] ms 198 ms 230 ms intercun-pya.cancun.com.mx [ ] ms 223 ms 271 ms ppp cancun.com.mx [ ] ms 252 ms 230 ms intercun-pya.cancun.com.mx [ ] ms 260 ms 256 ms ppp cancun.com.mx [ ] ms 259 ms 262 ms intercun-pya.cancun.com.mx [ ] ms 247 ms 281 ms ppp cancun.com.mx [ ] ms 257 ms 295 ms intercun-pya.cancun.com.mx [ ] ms 318 ms 305 ms ppp cancun.com.mx [ ] ms 344 ms 290 ms intercun-pya.cancun.com.mx [ ] ms 304 ms 287 ms ppp cancun.com.mx [ ] ms 307 ms 329 ms intercun-pya.cancun.com.mx [ ]
8 Network scanning Sonic wall event logs, 100 days, all odd ports scanned
9 Network denial of service Node traffic overload = Denial of Service Compromising the routing table will create partitions in the network Five percent of the internet cannot connect to the rest of the internet
10 Network costs Can you harden your critical applications and equipment? What is the price of convenience vs. cost of being compromised? What is the cost your business integrity (intangible asset)? What are the costs of your equipment (tangible)? What are the appropriate tactics and strategy? One of the first rules in security is access Keys: physical and otherwise Encryption Doors: physical and otherwise Restricted routes
11 Network strategies Identify your assumptions Audit your network process Who is trusted and why? What has to be protected? Your only as secure as your weakest link Know your weaknesses Remember human factors
12 Network strategies Secure access Authentication: Who are you? Authorization: Limit the scope of access Accounting: Where have you been, and why? What are your company s policies? Security must be pervasive and enforced
13 Network security tactics Control access Use appropriate p technology Passwords: change them Encryption of secrets Use built in technology Routers Access lists Source and destination limiting Disable the ability to discover your network Rate limiting iti commands Disable easily compromised technologies SNMP vs. SNMP v3: keep your secrets
14 Network security tactics Switches Be specific with trunk ports Turn off Dynamic Trunking Protocol on all ports Assign remaining ports to access VLANs Use DHCP snooping
15 Best practices for IP security Application level attack Intrusion detection systems Snort Use application layer gateway Has the ability to open and close pinholes dynamically in firewalls
16 Best practices for IP security Distributed Denial of Service Maintain current patch levels Install and maintain antivirus system Use application-aware IDP systems Establish policy-based security zones Use VLANS to protect voice/video traffic from data network attacks
17 Best practices for IP security Eavesdropping Isolate critical traffic on VLANS Apply encryption selectively Viruses Worms
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