主页 / unix / 问题

问题[ip-address](unix)

Martin Hope
Tim
Asked: 2019-03-24 14:52:48 +0800 CST
  • 7

根据https://networkengineering.stackexchange.com/a/57909/，发送到 192.168.1.97 的数据包“不会离开主机，而是被视为从网络接收到的数据包，地址为 192.168.1.97。” 与发送数据包环回 127.0.0.1 相同。

为什么nmap 127.0.0.1返回的服务多于nmap 192.168.1.97？

是否nmap 127.0.0.1一定也返回由返回的那些服务nmap 192.168.1.97？监听的服务器是否192.168.1.97也必须监听127.0.0.1？

$ nmap -p0-65535 192.168.1.97

Starting Nmap 7.60 ( https://nmap.org ) at 2019-03-23 19:18 EDT
Nmap scan report for ocean (192.168.1.97)
Host is up (0.00039s latency).
Not shown: 65532 closed ports
PORT      STATE SERVICE
22/tcp    open  ssh
111/tcp   open  rpcbind
3306/tcp  open  mysql
33060/tcp open  mysqlx

Nmap done: 1 IP address (1 host up) scanned in 9.55 seconds

$ nmap -p0-65535 localhost

Starting Nmap 7.60 ( https://nmap.org ) at 2019-03-23 19:18 EDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00033s latency).
Other addresses for localhost (not scanned):
Not shown: 65529 closed ports
PORT      STATE SERVICE
22/tcp    open  ssh
111/tcp   open  rpcbind
631/tcp   open  ipp
3306/tcp  open  mysql
5432/tcp  open  postgresql
9050/tcp  open  tor-socks
33060/tcp open  mysqlx

Nmap done: 1 IP address (1 host up) scanned in 5.39 seconds

谢谢。

ip-address nmap
Martin Hope
Tim
Asked: 2019-03-23 04:57:18 +0800 CST
  • 1

是docker0，lo并且 virbr0是虚拟网络接口？

为什么分配私有docker0而virbr0不是环回IP地址？

如果私有 IP 地址可以像环回地址一样工作，是否可以lo分配一个私有 IP 地址而不是环回 IP 地址？

环回地址是127.*.*.*. 它们是否总是形成一个网络，而不是像示例中那样被分成几个较小的网络？

192.168.*.*是一系列私有 IP 地址。它们是否经常分成几个较小的网络，如示例 (wlx8和virbr0)？

谢谢。

$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:a6:79:a6:bc  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1552397  bytes 88437726 (88.4 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1552397  bytes 88437726 (88.4 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:b1:aa:1f  txqueuelen 1000  (Ethernet)
        RX packets 123  bytes 12102 (12.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 39  bytes 4300 (4.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlx8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.97  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::a0df:c436:afb1:8b45  prefixlen 64  scopeid 0x20<link>
        ether   txqueuelen 1000  (Ethernet)
        RX packets 991338  bytes 536052615 (536.0 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 618233  bytes 101520924 (101.5 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
ip-address private-network
Martin Hope
Tim
Asked: 2019-03-21 14:28:42 +0800 CST
  • -3
$ sudo netstat -ap | grep postg
tcp        0      0 localhost:postgresql    0.0.0.0:*               LISTEN      1567/postgres       
udp        0      0 localhost:57504         localhost:57504         ESTABLISHED 1567/postgres       
unix  2      [ ACC ]     STREAM     LISTENING     27116    1567/postgres        /var/run/postgresql/.s.PGSQL.5432

$ sudo netstat -ap | grep mysql
tcp6       0      0 [::]:mysql              [::]:*                  LISTEN      23683/mysqld        
tcp6       0      0 [::]:33060              [::]:*                  LISTEN      23683/mysqld        
unix  2      [ ACC ]     STREAM     LISTENING     1169294  23683/mysqld         /var/run/mysqld/mysqld.sock
unix  2      [ ACC ]     STREAM     LISTENING     1169513  23683/mysqld         /var/run/mysqld/mysqlx.sock
unix  2      [ ]         DGRAM                    1169211  23683/mysqld

0.0.0.0:*,[::]:mysql和是什么[::]:*意思？

*是指所有端口吗？

0.0.0.0 根据 Tanenbaum 的计算机网络，意思是“这个网络”或“这个主机”。什么时候用于这个网络，什么时候用于这个主机？

谢谢。

netstat ip-address
Martin Hope
Hyperbola
Asked: 2018-10-19 06:35:58 +0800 CST
  • 0

我正在尝试反向查找主机名列表以找到它们的 IP 并写入文件。我指的是本教程并对其进行扩展以使用主机名列表。我是 Bash 脚本的新手，这是我想出的，但没有按需要打印，

for name in hostA.com hostB.com hostC.com;
do
    host $name | grep "has address" | sed 's/.*has address //' |
    awk '{print "allow\t\t" $1 ";" }' > ./allowedip.inc
done
scripting ip-address
Martin Hope
ady6831983
Asked: 2018-08-09 10:54:15 +0800 CST
  • 1

我有一个包含 IP 和端口号的文件。我想取出端口号并保留IP。

xyz  10.93.10.13:58160).
xyz 10.93.10.13:58161).
xyz 10.18.104.181:12466).
xyz 10.93.10.13:60585).
wxy 10.93.10.13:60586).
wxy 10.93.10.13:60587).
ADMIN loopback[127.0.0.1]:33955).
ADMIN loopback[127.0.0.1]:33957).
ADMIN loopback[127.0.0.1]:33961).
ADMIN loopback[127.0.0.1]:33962).

预期产出

xyz 10.93.10.13
xyz 10.93.10.13
xyz 10.18.104.181
xyz 10.93.10.13
wxy 10.93.10.13
wxy 10.93.10.13
ADMIN loopback[127.0.0.1]
ADMIN loopback[127.0.0.1]
ADMIN loopback[127.0.0.1]
ADMIN loopback[127.0.0.1]

我尝试了一个行不通的蹩脚程序

cat 1.txt|grep -v [:12312]

谢谢

text-processing ip-address