访问列表防御
1.创建访问列表
| access-list 101 deny udp any any eq 1434 access-list 101 permit ip any any |
2.匹配访问列表和数据包长度
| class-map match-all slammer_worm match access-group 101 match packet length min 404 max 404 |
3.丢弃所匹配的数据包
| policy-map drop-slammer-worm class slammer_worm police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop |
NBAR
1. Create custom protocol
| ip nbar port-map custom-01 udp 1434 |
2. Create class-map
| class-map match-all slammer_worm match protocol custom-01 match packet length min 404 max 404 |
3. Use class-based policing to drop the matching packets at the ingress interface
| policy-map drop-slammer-worm class slammer_worm police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop |
NetFlow
| Router# config t Router# (config) interface serial 0/1 Router#(config-if) ip route-cache flow Router#(config-if) exit Router#(config) exit Router# |
输出统计表
| Router# (config) ip flow-export 192.168.155.1 700 To view NetFlow statistics for port 1434: Router# show ip cache flow | include 059A |
CAR
| Router# (config) access-list 150 deny udp any any eq 1434 Router# (config) access-list 150 permit ip any any Router# (config) interface fastEthernet 0/0 Router# (config-if) rate-limit input access-group rate-limit 150 8000 1500 20000 conform-action drop exceed-action drop Router# (config-if) exit Router# (config) exit Router# |
ACL补充
| access-list 115 deny udp any any eq 1434 access-list 115 permit ip any any |
| ip access-group 115 in ip access-group 115 out |
注意,如果你想追踪来源,最好使用netflow,而不要使用log。
病毒发送大量随机地址,如果路由器接口使用了“ICMP unreachable”命令的话,对这些大量的无效地址响应将导致路由器性能下降。因此,推荐使用以下命令:
| Router(config)# interface Router(if-config)# no&n
最新评论网友评论相关文章最新文章邮件订阅
|

