Difference between revisions of "Netband Project - IOS firewall"
From Teknologisk videncenter
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ip access-group 101 in | ip access-group 101 in | ||
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Revision as of 11:35, 27 April 2009
<accesscontrol>NetBand</accesscontrol> This page is part of the Netband Project
Contents
Context Based Access Control (CBAC)
- filters TCP and UDP packets based on application-layer protocol session information.
- more flexible than access control lists, that checks packets at the network layer, or at most, the transport layer
- inspects packet sequence numbers in TCP connections
- detects unusually high rates of new connections and issue alert messages.
- creates temporary openings in the return acl to allow traffic back in.
Configuration
ip inspect audit-trail ip inspect name iosfw ftp ip inspect name iosfw tcp ip inspect name iosfw udp ip inspect name iosfw http audit-trail on ip inspect name iosfw https ! interface FastEthernet0/0 description OUTSIDE ip inspect iosfw out ip access-group 101 in ! access-list 101 permit udp any eq isakmp any eq isakmp access-list 101 permit esp any any access-list 101 permit tcp any any eq 22 access-list 101 deny ip any any log
Verificcation
B1rt1#sh ip inspect sessions Half-open Sessions Session 65E15880 (192.168.0.1:123)=>(10.255.255.13:123) udp SIS_OPENING