这让我很烦。
当指定超过 160 个 IP 地址时，我始终有一个设备无法响应 nmap 扫描。我似乎在 150-160 个 IP 地址之间得到混合结果，而少于 150 个 IP 地址时它总是响应。
该设备是 HP 打印机，应该没什么大问题。
目的是进行简单的扫描，仅查看该段上有哪些活动。该脚本将在我们各种网络和该段上的服务器上运行。我们之前使用的是 fping 和 arp 的组合，现在尝试将其替换为 nmap。
# ping -c1 10.10.0.155
PING 10.10.0.155 (10.10.0.155) 56(84) bytes of data.
64 bytes from 10.10.0.155: icmp_seq=1 ttl=60 time=6.75 ms
--- 10.10.0.155 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 6ms
rtt min/avg/max/mdev = 6.755/6.755/6.755/0.000 ms
仅扫描设备的示例：
# nmap -R -sn -d 10.10.0.155
--------------- Timing report ---------------
hostgroups: min 1, max 100000
rtt-timeouts: init 1000, min 100, max 10000
max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
parallelism: min 0, max 0
max-retries: 10, host-timeout: 1000
min-rate: 0, max-rate: 0
---------------------------------------------
Initiating ARP Ping Scan at 15:35
Scanning 10.10.0.155 [1 port]
Packet capture filter (device eth0): arp and arp[18:4] = 0x0050569A and arp[22:2] = 0x002B
Completed ARP Ping Scan at 15:35, 0.01s elapsed (1 total hosts)
Overall sending rates: 71.98 packets / s, 3023.32 bytes / s.
mass_rdns: Using DNS server 10.10.0.10
mass_rdns: Using DNS server 10.10.0.11
Initiating Parallel DNS resolution of 1 host. at 15:35
mass_rdns: 0.00s 0/1 [#: 2, OK: 0, NX: 0, DR: 0, SF: 0, TR: 1]
Completed Parallel DNS resolution of 1 host. at 15:35, 0.00s elapsed
DNS resolution of 1 IPs took 0.00s. Mode: Async [#: 2, OK: 1, NX: 0, DR: 0, SF: 0, TR: 1, CN: 0]
Nmap scan report for vd05.mydomain.com (10.10.0.155)
Host is up, received arp-response (0.0014s latency).
MAC Address: 00:10:83:56:E4:94 (Hewlett-packard Company)
Final times for host: srtt: 1391 rttvar: 5000 to: 100000
Read from /usr/share/nmap: nmap-mac-prefixes nmap-payloads.
Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds
然后以更大的范围运行我只是让主机关闭：
# nmap -R -sn -d 10.10.0.0/24
-or-
# nmap -R -sn -d 10.10.0.90-254
...
Nmap scan report for vd05.mydomain.com (10.10.0.155) [host down, received no-response]
...
感觉这可能更多的是一个超时问题，但 nmap 默认值看起来已经足够了？
有什么建议么？