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DHCP 的讨论(iptables 对其无效?)
-sU UDP scans: This method is used to determine which UDP (User
Datagram Protocol, RFC 76 ports are open on a host. The tech-
nique is to send 0 byte UDP packets to each port on the target
machine. If we receive an ICMP port unreachable message, then
the port is closed. If a UDP response is received to the probe
(unusual), the port is open. If we get no response at all, the
state is "open|filtered", meaning that the port is either open
or packet filters are blocking the communication. Versions scan
(-sV) can be used to help differentiate the truly open ports
from the filtered ones.
关于UDP端口的扫描,这个是nmap的一段man,可以看看,UDP也是可以扫描的,只是通过icmp的辅助来识别,而且我的映象中比较慢来着。
另外,开启ntop服务,可以很容易的找到网内机子所提供的服务,找到dhcp服务器不是问题。
而且这么多的帖子看下来,我没明白是NAT提供dhcp还是另外一台机子提供dhcp。也就是一直没明白这个试验的拓扑是怎样的。 |
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