! --- block TFTP
access-list 115 deny udp any any eq 69
! --- block W32.Blaster related protocols
access-list 115 deny tcp any any eq 135
access-list 115 deny udp any any eq 135
! --- block other vulnerable MS protocols
access-list 115 deny udp any any eq 137
access-list 115 deny udp any any eq 138
access-list 115 deny tcp any any eq 139
access-list 115 deny udp any any eq 139
access-list 115 deny tcp any any eq 445
access-list 115 deny tcp any any eq 593
! --- block remote access due to W32.Blaster
access-list 115 deny tcp any any eq 4444
! --- Allow all other traffic -- insert
! --- other existing access-list entries here
access-list 115 permit ip any any
interface
ip access-group 115 in
ip access-group 115 out
另外，阻止非法地址的命令是:
Router(config)# interface
Router(if-config)# no ip unreachables
如果此命令不能禁止，可参考下面这个命令:
Elab(config)# ip icmp rate-limit unreachable
VACL on the CatOS
! --- block TFTP
set security acl ip BLASTER deny udp any any eq 69
! --- block vulnerable MS protocols
! --- Blaster related
set security acl ip BLASTER deny tcp any any eq 135
set security acl ip BLASTER deny udp any any eq 135
! --- Non-blaster related
set security acl ip BLASTER deny tcp any any eq 137
set security acl ip BLASTER deny udp any any eq 137
set security acl ip BLASTER deny tcp any any eq 138
set security acl ip BLASTER deny udp any any eq 138
set security acl ip BLASTER deny tcp any any eq 139
set security acl ip BLASTER deny udp any any eq 139
set security acl ip BLASTER deny tcp any any eq 593
! --- block remote access due to W32.Blaster
set security acl ip BLASTER deny tcp any any eq 4444
! --- Allow all other traffic
! --- insert other existing access-list entries here
set security acl ip BLASTER permit any any
! -- applies both inbound and outbound
commit security acl BLASTER
set security acl map BLASTER
PIX
access-list acl_inside deny udp any any eq 69
access-list acl_inside deny tcp any any eq 135
access-list acl_inside deny udp any any eq 135
access-list acl_inside deny tcp any any eq 137
access-list acl_inside deny udp any any eq 137
access-list acl_inside deny tcp any any eq 138
access-list acl_inside deny udp any any eq 138
access-list acl_inside deny tcp any any eq 139
access-list acl_inside deny udp any any eq 139
access-list acl_inside deny tcp any any eq 445
access-list acl_inside deny tcp any any eq 593
access-list acl_inside deny tcp any any eq 4444
! --- insert previously configured acl statements here,
! --- or permit all other traffic out
access-list acl_inside permit ip any any
access-group acl_inside in interface inside