网络基础管理
2020-02-01 20:01
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网络基础管理
1.ip
- 命令名称： ip link show
作用：查看网络接口所有地址
实例：
[root@localhost network-scripts]# ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff
- 命令名称： ip -s link show
作用：显示报文的统计信息
实例:
[root@localhost network-scripts]# ip -s link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 RX: bytes packets errors dropped overrun mcast 352 4 0 0 0 0 TX: bytes packets errors dropped carrier collsns 352 4 0 0 0 0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 8195791 11348 0 0 0 0 TX: bytes packets errors dropped carrier collsns 1060520 5966 0 0 0 0
- 命令名称：ip link set lo down和 ip link set lo up
作用：禁用和启用网络接口lo
实例：
[root@localhost network-scripts]# ip link set lo down [root@localhost network-scripts]# ip link show 1: lo: <LOOPBACK> mtu 65536 qdisc noqueue state DOWN mode DEFAULT qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff [root@localhost network-scripts]# ip link set lo up [root@localhost network-scripts]# ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff
- 命令名称：ip a
作用：查看网络接口的ip地址
实例：
[root@localhost network-scripts]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff inet 192.168.100.128/24 brd 192.168.100.255 scope global dynamic eth0 valid_lft 2588947sec preferred_lft 2588947sec inet6 fe80::f412:3a46:cc20:22d/64 scope link valid_lft forever preferred_lft forever
- 命令名称：ip addr add 192.168.100.22/24 dev eth0
作用：添加ip地址到设备eth0里
实例：
[root@localhost network-scripts]# ip addr add 192.168.100.22/24 dev eth0 [root@localhost network-scripts]# ip a s eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff inet 192.168.100.128/24 brd 192.168.100.255 scope global dynamic eth0 valid_lft 2588634sec preferred_lft 2588634sec inet 192.168.100.22/24 scope global secondary eth0 valid_lft forever preferred_lft forever inet6 fe80::f412:3a46:cc20:22d/64 scope link valid_lft forever preferred_lft forever
- 命令名称：ip addr del 192.168.100.22/24 dev eth0
作用：删除设备eth的ip地址
实例：
[root@localhost network-scripts]# ip addr del 192.168.100.22/24 dev eth0 [root@localhost network-scripts]# ip a s dev eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff inet 192.168.100.128/24 brd 192.168.100.255 scope global dynamic eth0 valid_lft 2588481sec preferred_lft 2588481sec inet6 fe80::f412:3a46:cc20:22d/64 scope link valid_lft forever preferred_lft forever
2.route
- 命令名称：route -n
作用：查看当前路由表的相关信息并以数字方式显示
实例：
[root@localhost network-scripts]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.100.2 0.0.0.0 UG 100 0 0 eth0 192.168.100.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
- 命令名称:route add -net 100.1.1.0/24 gw 192.168.100.2 dev eth0
作用：添加一条到100.1.1.0/24网段网关是192.168.100.2的路由
实例：
[root@localhost network-scripts]# route add -net 100.1.1.0/24 gw 192.168.100.2 dev eth0 [root@localhost network-scripts]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.100.2 0.0.0.0 UG 100 0 0 eth0 100.1.1.0 192.168.100.2 255.255.255.0 UG 0 0 0 eth0 192.168.100.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
- 命令名称：route del -net 100.1.1.0/24
作用：删除到100.1.1.0/24的路由
实例：
[root@localhost network-scripts]# route del -net 100.1.1.0/24
3.网络接口配置文件
网络接口即网卡，其配置文件的路径是/etc/sysconfig/network-scripts/ifcfg-INTERFACE_NAME
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
NAME=eth1
UUID=03be31f5-a3c1-4f8d-88b3-aea6e85c869f
DEVICE=eth1
ONBOOT=yes
IPADDR=172.16.12.130
NETMASK=255.255.255.0
GATEWAY=172.16.12.2
DNS1=172.16.12.2
//网卡配置说明
//参数 说明
BOOTPROTO=none //引导协议，可选值有｛static｜none｜dhcp｜bootp｝。如果要使用静态地址，使用static或none都可以
NM_CONTROLLED //NM是NetworkManager的简写，NM是由RHEL研发的在RHEL6中取代network脚本来实现网络管理、配置的服务脚本
//可选值有{ yes ｜ no }
//此项是设定此网卡是否接受NM控制。CentOS6建议设为“no”
TYPE //接口类型。常见的接口类型有：Ethernet，Bridge
UUID //设备的惟一标识
HWADDR //硬件地址，要与硬件中的地址保持一致，可省
IPADDR=172.16.12.130 //固定IP地址
PREFIX=24 //子网掩码
NETMASK=255.255.255.0 //子网掩码
GATEWAY=172.16.12.2 //默认网关
DNS1=172.16.12.2 //第一个DNS服务器指向
DNS2 //第二个DNS服务器指向
DNS3 //第三个DNS服务器指向
DEVICE=eth1 //关联的设备名称，要与文件名的后半部"INTERFACE_NAME"保持一致
NAME="eth1" //连接名称
ONBOOT=yes //在系统引导时是否自动激活此网络接口，可选值有{ yes ｜ no }
DEFROUTE=yes //将接口设定为默认路由[yes|no]
USERCTL={yes|no} //是否允许普通用户控制此接口的启用与禁用
PEERDNS={yes|no} //是否在BOOTPROTO为dhcp时接受由dhcp服务器指定的DNS地址，此项设为yes时获得的DNS地址将直接覆盖至/etc/resolv.conf文件中
4.NetworkManager管理网络
- 命令名称：network-scripts]# nmcli dev
作用：查看设备状态
实例：
[root@localhost network-scripts]# nmcli dev 设备 类型 状态 连接 eth0 ethernet 连接的 eth0 lo loopback 未托管 --
- 命令名称： nmcli dev show eth0
作用：查看设定设备的详细状态
实例：
[root@localhost network-scripts]# nmcli dev show eth0 GENERAL.设备: eth0 GENERAL.类型: ethernet GENERAL.硬盘: 00:0C:29:54:2B:8B GENERAL.MTU: 1500 GENERAL.状态: 100 (连接的) GENERAL.连接: eth0 GENERAL.连接路径: /org/freedesktop/NetworkManager/ActiveConnection/10 WIRED-PROPERTIES.载波: 开 IP4.地址[1]: 192.168.100.128/24 IP4.网关: 192.168.100.2 IP4.DNS[1]: 8.8.8.8 IP4.DNS[2]: 114.114.114.114 IP6.网关: --
5.使用原生的network管理网络
//设置NetworkManger开机不启动, 同时停止NetworkManger服务
[root@localhost ~]# systemctl disable NetworkManager
[root@localhost ~]# systemctl stop NetworkManager
//添加一块物理网卡, 然后新增网络连接配置文件
//复制配置eth0配置文件为eth1
[root@localhost ~]# cp /etc/sysconfig/network-scripts/{ifcfg-eth0,ifcfg-eth1}
//编辑网卡配置文件
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
NAME=eth1
UUID=03be31f5-a3c1-4f8d-88b3-aea6e85c869f
DEVICE=eth1
NM_CONTROLLED=no
ONBOOT=yes
IPADDR=172.16.12.130
NETMASK=255.255.255.0
GATEWAY=172.16.12.2
DNS1=172.16.12.2
//重启network网络服务加载网络并设置开机启动
[root@localhost ~]# systemctl restart network
[root@localhost ~]# systemctl enable network
6.ping
- 命令名称：ping -c 3 -i 3 www.baidu.com
作用：//ping命令常用选项：
-c 指定ping的次数
-i 指定ping包的发送间隔
-w 如果ping没有回应, 则在指定超时时间后退出
实例：
[root@localhost network-scripts]# ping -c 3 -i 3 www.baidu.com PING www.a.shifen.com (182.61.200.7) 56(84) bytes of data. 64 bytes from localhost (182.61.200.7): icmp_seq=1 ttl=128 time=31.1 ms 64 bytes from localhost (182.61.200.7): icmp_seq=2 ttl=128 time=38.6 ms 64 bytes from localhost (182.61.200.7): icmp_seq=3 ttl=128 time=28.0 ms --- www.a.shifen.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 6008ms rtt min/avg/max/mdev = 28.007/32.587/38.607/4.450 ms
7.host与nslookup
- 命令名称：host www.baidu.com
作用：用于查询dns记录
实例：
[root@localhost network-scripts]# host www.baidu.com www.baidu.com is an alias for www.a.shifen.com. www.a.shifen.com has address 182.61.200.7 www.a.shifen.com has address 182.61.200.6
- 命令名称： nslookup www.baidu.com
作用：用于查询dns记录
实例：
[root@localhost network-scripts]# nslookup www.baidu.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. Name: www.a.shifen.com Address: 182.61.200.6 Name: www.a.shifen.com Address: 182.61.200.7
- 命令名称：traceroute www.baidu.com
作用：命令用于路由跟踪, 检测网络故障出现在ISP运营商或是对端服务无法响应
实例：
[root@localhost network-scripts]# traceroute www.baidu.com traceroute to www.baidu.com (182.61.200.6), 30 hops max, 60 byte packets 1 gateway (192.168.100.2) 0.255 ms 0.195 ms 0.193 ms 2 * * * 3 * * * 4 * * * 5 * * * 6 * * * 7 * * *
8.ss
- 命令名称：ss -a
作用：查看所有套接字
实例：
[root@localhost network-scripts]# ss -a Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port nl UNCONN 0 0 rtnl:kernel * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 4352 0 tcpdiag:ss/6094 * nl UNCONN 768 0 tcpdiag:kernel * nl UNCONN 0 0 xfrm:kernel * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:kernel * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 audit:kernel * nl UNCONN 0 0 audit:auditd/5887 *
- 命令名称：ss -t
作用：与tcp协议相关
实例：
[root@localhost network-scripts]# ss -t State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 52 192.168.100.128:ssh 192.168.100.1:guibase
- 命令名称：ss -u
作用：与udp协议相关的套接字
实例：
[root@localhost network-scripts]# ss -u Recv-Q Send-Q Local Address:Port Peer Address:Port
- 命令名称:ss -l
作用：查看listen状态（监听状态）
实例：
[root@localhost network-scripts]# ss -l Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port nl UNCONN 0 0 rtnl:kernel * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 4352 0 tcpdiag:ss/6101 * nl UNCONN 768 0 tcpdiag:kernel * nl UNCONN 0 0 xfrm:kernel * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:kernel * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 audit:kernel * nl UNCONN 0 0 audit:auditd/5887 * nl UNCONN 0 0 audit:systemd/1 * nl UNCONN 0 0 fiblookup:kernel * nl UNCONN 0 0 connector:kernel *
- 命令名称：ss -n
作用：查看套接字的端口以数字显示
实例：
[root@localhost network-scripts]# ss -n Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port u_str ESTAB 0 0 * 19938 * 19939 u_str ESTAB 0 0 * 18864 * 16761 u_str ESTAB 0 0 * 19942 * 19943 u_str ESTAB 0 0 * 19948 * 19949 u_str ESTAB 0 0 /run/systemd/journal/stdout 16663 * 17603 u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 16632 * 15748 u_str ESTAB 0 0 * 19945 * 19946 u_str ESTAB 0 0 * 17603 * 16663 u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 16761 * 18864 u_str ESTAB 0 0 * 19973 * 19972 u_str ESTAB 0 0 * 19943 * 19942 u_str ESTAB 0 0 * 19972 * 19973 u_str ESTAB 0 0 * 19936 * 19935 u_str ESTAB 0 0 * 19954 * 19955 u_str ESTAB 0 0 * 19961 * 19960 u_str ESTAB 0 0 * 19960 * 19961
- 命令名称：ss -p
作用：查看相关的程序及pid
实例：
[root@localhost network-scripts]# ss -p
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
u_str ESTAB 0 0 * 19938 * 19939 users:(("master",pid=1363,fd=26))
u_str ESTAB 0 0 * 18864 * 16761 users:(("NetworkManager",pid=813,fd=13))
u_str ESTAB 0 0 * 19942 * 19943 users:(("master",pid=1363,fd=30))
u_str ESTAB 0 0 * 19948 * 19949 users:(("master",pid=1363,fd=36))
u_str ESTAB 0 0 /run/systemd/journal/stdout 16663 * 17603 users:(("systemd-journal",pid=590,fd=21))
u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 16632 * 15748 users:(("dbus-daemon",pid=767,fd=10))
u_str ESTAB 0 0 * 19945 * 19946 users:(("master",pid=1363,fd=33))
u_str ESTAB 0 0 * 17603 * 16663 users:(("vmtoolsd",pid=780,fd=2),("vmtoolsd",pid=780,fd=1))
u_str ESTAB 0 0 /var/run/dbus/system_bus_socket 16761 * 18864 users:(("dbus-daemon",pid=767,fd=18))
u_str ESTAB 0 0 * 19973 * 19972
9.作业
1.如何查看系统中每个ip的连接数
[root@localhost network-scripts]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:54:2b:8b brd ff:ff:ff:ff:ff:ff inet 192.168.100.128/24 brd 192.168.100.255 scope global dynamic eth0 valid_lft 2589667sec preferred_lft 2589667sec inet6 fe80::f412:3a46:cc20:22d/64 scope link valid_lft forever preferred_lft forever
2.请列出下列服务使用的端口,http,ftp,ssh,telnet,mysql,dns
http=80/tcp https=443/tcp ftp=20,21/tcp ssh=22/tcp telent=23/tcp mysql（mysql数据库）=3306 rsync（远程同步） =873/rsync redis（redis数据库） =6379/tcp dns=53/udp
3.如何在虚拟机上新增加一块网卡，并配置IP为172.16.0.10，指定网关为172.16.0.1
[root@localhost network-scripts]# ls
ifcfg-eth0 ifdown-isdn ifdown-tunnel ifup-isdn ifup-Team
ifcfg-lo ifdown-post ifup ifup-plip ifup-TeamPort
ifdown ifdown-ppp ifup-aliases ifup-plusb ifup-tunnel
ifdown-bnep ifdown-routes ifup-bnep ifup-post ifup-wireless
ifdown-eth ifdown-sit ifup-eth ifup-ppp init.ipv6-global
ifdown-ippp ifdown-Team ifup-ippp ifup-routes network-functions
ifdown-ipv6 ifdown-TeamPort ifup-ipv6 ifup-sit network-functions-ipv6
[root@localhost network-scripts]# cp /etc/sysconfig/network-scripts/{ifcfg-eth0,ifcfg-eth1}
[root@localhost network-scripts]# ls
ifcfg-eth0 ifdown-isdn ifup ifup-plusb ifup-wireless
ifcfg-eth1 ifdown-post ifup-aliases ifup-post init.ipv6-global
ifcfg-lo ifdown-ppp ifup-bnep ifup-ppp network-functions
ifdown ifdown-routes ifup-eth ifup-routes network-functions-ipv6
ifdown-bnep ifdown-sit ifup-ippp ifup-sit
ifdown-eth ifdown-Team ifup-ipv6 ifup-Team
ifdown-ippp ifdown-TeamPort ifup-isdn ifup-TeamPort
ifdown-ipv6 ifdown-tunnel ifup-plip ifup-tunnel
[root@localhost network-scripts]# vi ifcfg-eth1
[root@localhost network-scripts]# cat ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
NAME=eth1
UUID=9ce7fa00-8401-4088-a330-49d16236b0c3
DEVICE=eth1
NM_CONTROLLED=no
ONBOOT=yes
IPADDR=172.16.0.10
NETMASK=255.255.255.0
GATEWAY=172.16.0.1
DNS1=8.8.8.8
[root@localhost ~]# systemctl restart network
[root@localhost ~]# systemctl enable network
4.详细描述dns解析过程，以访问www.baidu.com为例
5.如何查看系统中运行了多少个进程
[root@localhost network-scripts]# ss -a Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port nl UNCONN 0 0 rtnl:kernel * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 0 0 rtnl:-188742867 * nl UNCONN 768 0 tcpdiag:kernel * nl UNCONN 4352 0 tcpdiag:ss/2612 * nl UNCONN 0 0 xfrm:kernel * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:kernel * nl UNCONN 0 0 selinux:dbus-daemon/767 * nl UNCONN 0 0 selinux:systemd/1 * nl UNCONN 0 0 audit:kernel * nl UNCONN 0 0 audit:systemd/1 * nl UNCONN 0 0 audit:auditd/743 * nl UNCONN 0 0 fiblookup:kernel * nl UNCONN 0 0 connector:kernel * nl UNCONN 0 0 nft:kernel * nl UNCONN 0 0 uevent:systemd-logind/781 * nl UNCONN 0 0 uevent:tuned/1129 * nl UNCONN 0 0 uevent:NetworkManager/813 * nl UNCONN 0 0 uevent:systemd/1 * nl UNCONN 0 0 uevent:-4130 * nl UNCONN 0 0 uevent:-4132 * nl UNCONN 0 0 uevent:-4131 * nl UNCONN 0 0 uevent:-4113
6.如何查看系统中启动了哪些端口
[root@localhost network-scripts]# ss -an Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port nl UNCONN 0 0 0:0 * nl UNCONN 0 0 0:-188742867 * nl UNCONN 0 0 0:-188742867 * nl UNCONN 768 0 4:0 * nl UNCONN 4352 0 4:2610 * nl UNCONN 0 0 6:0 * nl UNCONN 0 0 7:1 *
7.如何查看是否开启80端口，及查看sshd进程是否存在
[root@localhost network-scripts]# ss -ant|grep 80
[root@localhost network-scripts]# ss -ap|grep sshd
u_dgr UNCONN 0 0 * 23919 * 2892 users:((sshd",pid=1836,fd=4))
u_str ESTAB 0 0 * 20547 * 19589 users:((sshd",pid=1127,fd=2),("sshd",pid=1127,fd=1))
tcp LISTEN 0 128 *:ssh *:* users:((sshd",pid=1127,fd=3))
tcp ESTAB 0 0 192.168.100.128:ssh 192.168.100.1:infowave users:(("sshd",pid=1836,fd=3))
tcp LISTEN 0 128 :::ssh :::* users:((sshd",pid=1127,fd=4))
8.列出所有处于监听状态的tcp端口
[root@localhost network-scripts]# ss -tanl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::*
9.查看所有的端口信息, 包括 PID 和进程名称
[root@localhost network-scripts]# ss -atp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:ssh *:* users:(("sshd",pid=1127,fd=3))
LISTEN 0 100 127.0.0.1:smtp *:* users:(("master",pid=1363,fd=13))
ESTAB 0 52 192.168.100.128:ssh 192.168.100.1:infowave users:(("sshd",pid=1836,fd=3))
LISTEN 0 128 :::ssh :::* users:(("sshd",pid=1127,fd=4))
LISTEN 0 100 ::1:smtp :::* users:(("master",pid=1363,fd=14))
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