
方法/步骤
1、进入linux,使用“ cat /etc/services ”命令,可以查看所有服务默认的端口列表信息。
2、使用“netstat”命令,查看正在连接的端口【连接】列表信息。
3、使用“nestat -a”命令,查看所有服务端口【监听、连接】列表信息。
4、套接字的种类除了t(TCP)、u(UDP)之外,还有w(RAW)、x(UNIX)套接字。
5、使用" netstat -ap"查看所有服务端口和对应的程序名称。
Router>enable 进入特权模式Router#configure terminal 进入配置模式
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface e 0/0 进入接口以太0/0
Router(config-if)#ip
Router(config-if)#ip address 192.168.1.1 255.255.255.0 配置IP地址和子网掩码
Router(config-if)#no shutdown 开启端口
%LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
Router(config-if)#exit退出
Router(config)#ip host xiay 192.168.1.2默认域名指向(可以不配置的)
Router(config)#exit退出
Router#show interfaces e 0/0查看以太0/0信息
Ethernet0/0 is up, line protocol is up开启端口
Hardware is Lance, address is 000C.4198.5973 (bia 000C.4198.5973)MAC地址
Internet address is 192.168.1.1/24IP和掩码
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of show interface counters never
Queueing strategy: fifo
Output queue 0/40, 0 dropsinput queue 0/75, 0 drops
5 minute input rate 1000 bits/sec, 2 packets/sec
5 minute output rate 1000 bits/sec, 2 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Router#ping 192.168.1.2pingIP地址
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms通了
Router#ping xiayping 域名(就是刚才定向的那个)
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms通了
Router#copy startup-config tftp 拷贝我的配置文件到tftp
Address or name of remote host []?xiay拷贝到这(也可以输入IP)
Destination filename []?1保存文件名
No NVRAM configuration present失败
Router#
Router#show startup-config 检查我的配置 没有
%% Non-volatile configuration memory is not present
Router#copy running-config startup-config 把我ram上的配置copy到nvram上去
Destination filename [startup-config]?
Building configuration...
[OK]
Router#sh startup-config 再查看下 OK东西有了
Current configuration : 677 bytes
!
Version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Router
!
!
!
ip subnet-zero
ip host xiay 192.168.1.2
!
!
!
!
!
!
!
!
!
Router#copy startup-config tftp 拷贝 同上
Address or name of remote host []?xiay
Destination filename []?1
!!!!!!!!!!成功了!!!!!!!
[OK]
8390 bytes copied in 7 secs
===================================
boson 行敲出来顺便给你贴上去的 够详细了把 不加分对不起我啊
在Linux中查找服务的端口方法1:使用grep命令
要使用grep命令在Linux中查找指定服务的默认端口号,只需运行:
$grep<port>/etc/services
例如,要查找SSH服务的默认端口,只需运行:
$grep ssh/etc/services
就这么简单。此命令应该适用于大多数Linux发行版。以下是我的Arch Linux测试机中的示例输出:
ssh 22/tcp
ssh 22/udp
ssh 22/sctp
sshell 614/tcp
sshell 614/udp
netconf-ssh 830/tcp
netconf-ssh 830/udp
sdo-ssh 3897/tcp
sdo-ssh 3897/udp
netconf-ch-ssh 4334/tcp
snmpssh 5161/tcp
snmpssh-trap 5162/tcp
tl1-ssh 6252/tcp
tl1-ssh 6252/udp
ssh-mgmt 17235/tcp
ssh-mgmt 17235/udp
正如你在上面的输出中所看到的,SSH服务的默认端口号是22。
让我们找到Apache Web服务器的端口号。为此,命令是:
$grep http/etc/services
#http://www.iana.org/assignments/port-numbers
http 80/tcp www www-http#WorldWideWeb HTTP
http 80/udp www www-http#HyperText Transfer Protocol
http 80/sctp#HyperText Transfer Protocol
https 443/tcp#http protocol over TLS/SSL
https 443/udp#http protocol over TLS/SSL
https 443/sctp#http protocol over TLS/SSL
gss-http 488/tcp
gss-http 488/udp
webcache 8080/tcp http-alt#WWW caching service
webcache 8080/udp http-alt#WWW caching service
[...]
FTP端口号是什么?这很简单!
$grep ftp/etc/services
ftp-data 20/tcp
ftp-data 20/udp
#21 is registered to ftp,but also used by fsp
ftp 21/tcp
ftp 21/udp fsp fspd
tftp 69/tcp
[...]
方法2:使用getent命令
如你所见,上面的命令显示指定搜索词“ssh”、“http”和“ftp”的所有端口名称和数字。这意味着,你将获得与给定搜索词匹配的所有端口名称的相当长的输出。
但是,你可以使用getent命令精确输出结果,如下所示:
$getent services ssh
ssh 22/tcp
$getent services http
http 80/tcp www www-http
$getent services ftp
ftp 21/tcp
如果你不知道端口名称,但是知道端口号,那么你只需将端口名称替换为数字:
$getent services 80
http 80/tcp
要显示所有端口名称和端口号,只需运行:
$getent services
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