February 2018
Intermediate to advanced
396 pages
9h 38m
English
Content preview from Advanced Infrastructure Penetration Testing
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Defenses
There are many other defense mechanisms to avoid OSPF attacks; the following are some of the defense layers:
- Transit-Only Networks: These configure routers to suppress the suffixes:
(config-router)#prefix-suppression
- Using hidden interfaces: These are sometimes called unnumbered interfaces:
(config-if)#ip unnumbered Ethernet 0
- Enable TTL Security:
(config-if)# Ip ospf ttl-security
- Enable MD5 crypto support:
(config-if)# Ip Ospf message-digest-key 1 md5 ab$c1
- Anti-spoofing-Ingress Filtering: This blocks malicious traffic by ensuring that the traffic is coming from trusted sources
- Link State Database Checksums: This makes sure that the OSPF LSDB is consistent
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