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红帽学习笔记[RHCE]网络配置与路由转发

网络配置基本的IPV4与IPV6
- 拓扑图
- 操作
拓展路由转发
- 拓扑图
- 操作

网络配置基本的IPV4与IPV6

拓扑图

最终要实现的目标

虚拟机RHEL1 与 RHEL2能够通过IPV6地址互相Ping通
通过/etc/hosts配置，使用RHEL1与RHEL2可以通过域名Ping通
RHEL1与RHEL2的 IPV4地址能够互相Ping通
物理机能够通过IPV6的地址 SSH到任何一台虚拟机上

操作

新加一块网卡

VMWare -> 编辑 -> 虚拟网络编辑器 -> 添加网络 -> 选择一块网卡，我选择了VMnet16

注： Win10 需要点击下面的用管理员运行的按钮更改设置。

配置网卡

1. 仅主机模式
2. 选中`将主机虚拟适配器连接到此网络`
3. 子网IP `192.168.22.0`，子网掩码不用改`255.255.255.0`

点击确定
此时在物理机上尝试ping 192.168.22.1应该是可以Ping通的。WMware会吧这个网段上192.168.22.1这个ip分给物理机。n

将增加的网卡分别加到两台虚拟机上

右键虚拟机 -> 设置 -> 添加 -> 网络适配器 -> 完成
选中刚才添加的网络适配器进行配置

1. 设备状态不需要更改
2. 网络连接 选中`自定义(U)：特定虚拟网络`
3. 在下拉列表中选中自己添加的网卡,我的是`VMnet16`
4. 确定

第二台虚拟机做同样的操作

在两台虚拟机上配置`IPV4`与 `IPV6`

在两台虚拟机上 `ip addr`

# 第一台
[root@rhel1 Desktop]# ip addr
4: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:fb:7d:19 brd ff:ff:ff:ff:ff:ff
# 第二台
[root@rhel2 ~]# ip addr    
8: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:10:6a:95 brd ff:ff:ff:ff:ff:ff

注：本次添加后，两块网卡的名称切好都是eno16777736，而其实未必是这样，本次恰好两台虚拟机都是配置的第一块网卡是VMnet16，如果配置时第几块不一样的时候，名称也将不同。

配置`IPV4`网络

VMnet16 网段是 192.168.22.0 对应的物理机IP是 192.168.22.1

第一台设备

##添加配置
[root@rhel1 Desktop]# nmcli connection add con-name ipv4-ipv6 ifname eno16777736 type ethernet ip4 192.168.22.10/24
Connection 'ipv4-ipv6' (2371b109-1edb-4e73-b4e1-b03068581d96) successfully added.
## 启动
[root@rhel1 Desktop]# nmcli connection up ipv4-ipv6 
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)
## 查看 
[root@rhel1 Desktop]# nmcli connection show 
NAME       UUID                                  TYPE            DEVICE       
ipv4-ipv6  2371b109-1edb-4e73-b4e1-b03068581d96  802-3-ethernet  eno16777736 
## 查看 `ip addr`
[root@rhel1 Desktop]# ip addr
4: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:fb:7d:19 brd ff:ff:ff:ff:ff:ff
    inet 192.168.22.10/24 brd 192.168.22.255 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fefb:7d19/64 scope link 
       valid_lft forever preferred_lft forever
## 在物理机上ping这个IP
C:Userskanewang>ping 192.168.22.10

Pinging 192.168.22.10 with 32 bytes of data:
Reply from 192.168.22.10: bytes=32 time<1ms TTL=64
Reply from 192.168.22.10: bytes=32 time=1ms TTL=64
Reply from 192.168.22.10: bytes=32 time=1ms TTL=64
Reply from 192.168.22.10: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.22.10:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 1ms, Average = 0ms

第二台设备做同样操作

IP 是 192.168.22.11

## 在物理机上ping
C:Userskanewang>ping 192.168.22.11

Pinging 192.168.22.11 with 32 bytes of data:
Reply from 192.168.22.11: bytes=32 time=3ms TTL=64
Reply from 192.168.22.11: bytes=32 time=2ms TTL=64
Reply from 192.168.22.11: bytes=32 time=1ms TTL=64
Reply from 192.168.22.11: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.22.11:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 3ms, Average = 1ms
## 在第一台虚拟机上ping
[root@rhel1 Desktop]# ping 192.168.22.11
PING 192.168.22.11 (192.168.22.11) 56(84) bytes of data.
64 bytes from 192.168.22.11: icmp_seq=1 ttl=64 time=0.753 ms
64 bytes from 192.168.22.11: icmp_seq=2 ttl=64 time=3.82 ms
^C
--- 192.168.22.11 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.753/2.288/3.823/1.535 ms

nmcli connect add命令

# 敲到 add 这一级别后 按两次 `Tab` 都有提示
[root@rhel1 Desktop]# nmcli connection add 
autoconnect  con-name     help         ifname       type 
1. autoconnect 是否自动连接
2. con-name    显示名称
3. help		   帮助
4. ifname	   网卡的名称 本次是`eno16777736`打eno两次tab也能出来
5. type 	   连接方式
6. ip4		   配置ipv4的IP

配置`IPV6`网络

IPV6我们同样使用这块网卡，但是WMware并没有给物理机配置IPV6我们需要手动配置。

配置物理机在网卡VMnet16上的IPV6地址：2019:ffff::1

注：::在IPV6中的意思是缩写，代表：连续多组0

物理机 -> 控制面板 -> Network and Internet -> Network and Sharing Center -> 左边栏 Change adapter settings -> VMware Network Adapter VMnet16
右键 -> Properties 属性 -> 点一下 Internet Protocol Version 6(TCP/IPV6)
此时下面的Properties 属性按钮可点击。点击。
勾中Use the following IPV6 address:分别填入

IPv6 address (IPv6地址):      			2019:ffff::1 
Subnet prefix length(子网前缀长度):        64

点击确定
本机测试一下

C:Userskanewang>ping -6 2019:ffff::1

Pinging 2019:ffff::1 with 32 bytes of data:
Reply from 2019:ffff::1: time<1ms
Reply from 2019:ffff::1: time<1ms
Reply from 2019:ffff::1: time=1ms
Reply from 2019:ffff::1: time<1ms

Ping statistics for 2019:ffff::1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 1ms, Average = 0ms

配置第一台虚拟机的IPV6

## 修改 `ipv4-ipv6`的链接配置
# 一定要加上  ipv6.method manual
[root@rhel1 Desktop]# nmcli connection modify ipv4-ipv6 ipv6.addresses "2019:ffff::100/64" ipv6.method manual
## 重启
[root@rhel1 Desktop]# nmcli connection up ipv4-ipv6 
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/10)
## 查看
[root@rhel1 Desktop]# ip addr
4: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:fb:7d:19 brd ff:ff:ff:ff:ff:ff
    inet 192.168.22.10/24 brd 192.168.22.255 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 2019:ffff::100/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fefb:7d19/64 scope link 
       valid_lft forever preferred_lft forever
## 物理机ping一下
C:Userskanewang>ping -6 2019:ffff::100

Pinging 2019:ffff::100 with 32 bytes of data:
Reply from 2019:ffff::100: time=10ms
Reply from 2019:ffff::100: time<1ms
Reply from 2019:ffff::100: time=1ms
Reply from 2019:ffff::100: time<1ms

Ping statistics for 2019:ffff::100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 10ms, Average = 2ms

第二台设备同样操作

IP是 2019:ffff::101

## 查看
[root@rhel2 ~]# ip addr
8: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:10:6a:95 brd ff:ff:ff:ff:ff:ff
    inet 192.168.22.11/24 brd 192.168.22.255 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 2019:ffff::101/128 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe10:6a95/64 scope link 
       valid_lft forever preferred_lft forever
## 物理机 ping
C:Userskanewang>ping -6 2019:ffff::101

Pinging 2019:ffff::101 with 32 bytes of data:
Reply from 2019:ffff::101: time=25ms
Reply from 2019:ffff::101: time<1ms
Reply from 2019:ffff::101: time<1ms
Reply from 2019:ffff::101: time<1ms

Ping statistics for 2019:ffff::101:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 25ms, Average = 6ms
## 第一个设备 ping 一下
[root@rhel1 Desktop]# ping6 2019:ffff::101
PING 2019:ffff::101(2019:ffff::101) 56 data bytes
64 bytes from 2019:ffff::101: icmp_seq=1 ttl=64 time=4.36 ms
64 bytes from 2019:ffff::101: icmp_seq=2 ttl=64 time=11.9 ms
^C
--- 2019:ffff::101 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1003ms
rtt min/avg/max/mdev = 4.364/8.157/11.951/3.794 ms

注意

设置ip时，后面跟的子网前缀的长度，一定要与字码掩码对应上。
ipv4.method manual , ipv6.method manual在修改connection时最好都加上。

配置域名访问

在虚拟机上设置域名

## 虚拟机1
[root@rhel1 Desktop]# hostname rhel1.node.com
[root@rhel1 Desktop]# hostnamectl set-hostname rhel1.node.com
## 虚拟机2 
[root@rhel2 Desktop]# hostname rhel2.node.com
[root@rhel2 Desktop]# hostnamectl set-hostname rhel2.node.com

更改 /etc/hosts

[root@rhel1 Desktop]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.22.11	rhel2.node.com
[root@rhel2 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
2019:ffff::100 rhel1.node.com
## 配置 IPV4 与 IPV6地址都是可以的

拓展路由转发

拓扑图

最终实现目标：

物理机使用网卡VMnet11可以SSH到三台虚拟机上
RHEL1 与 RHEL2 之间通过 VMnet12连接
RHEL2 与 RHEL3 之间通过 VMnet13连接
RHEL1 可以直接访问到 RHEL3

操作

注：做这个实验的时候，删除了所有网卡。三台虚机都增加了VMnet11、VMnet12、WMnet13三块网卡，包括网卡的顺序都相同。

# 保证 虚拟机的网卡号与正真网卡一一匹配
VMnet11->eno16777736
VMnet12->eno33554992
VMnet13->eno50332216

关于网关设置

实现上面的需求，是把RHEL2当做路由转发，所以RHEL1-RHEL2连接 RHEL1的网关必须是RHEL2，RHEL2-RHEL3连接RHEL3 的网关也必须是RHEL2

重新配置一下网络

物理机通过三台虚拟机的第一块网卡VMnet11连接虚拟机

物理机  ipv4 192.168.143.1  ipv6 2019:ac18::1
RHEL1  ipv4 192.168.143.10  ipv6 2019:ac18::100
RHEL2  ipv4 192.168.143.11  ipv6 2019:ac18::101
RHEL3  ipv4 192.168.143.12  ipv6 2019:ac18::102

命令

[root@rhel1 Desktop]#  nmcli connection add con-name control_connect ifname eno16777736 autoconnect yes type ethernet ip4 192.168.143.10/24 gw4 192.168.143.1 ip6  2019:ac18::100/64 gw6 2019:ac18::1
[root@rhel2 Desktop]#  nmcli connection add con-name control_connect ifname eno16777736 autoconnect yes type ethernet ip4 192.168.143.11/24 gw4 192.168.143.1 ip6  2019:ac18::101/64 gw6 2019:ac18::1
[root@rhel3 Desktop]#  nmcli connection add con-name control_connect ifname eno16777736 autoconnect yes type ethernet ip4 192.168.143.12/24 gw4 192.168.143.1 ip6  2019:ac18::102/64 gw6 2019:ac18::1

虚拟机RHEL1 与 RHEL2通过他们的第二块网卡VMnet12进行连接

RHEL1  ipv4 192.168.27.10  ipv6 2019:ac18:1::100
RHEL1  gw4 192.168.27.11   gw6 2019:ac18:1::101 # 网关配置成RHEL2的
RHEL2  ipv4 192.168.27.11  ipv6 2019:ac18:1::101

[root@rhel1 Desktop]#  nmcli connection add con-name connection12 ifname eno33554992 autoconnect yes type ethernet ip4 192.168.140.10/24 gw4 192.168.140.11 ip6  2019:ac18:1::100/64 gw6 2019:ac18:1::101
[root@rhel2 ~]# nmcli connection add con-name connection12 ifname eno33554992 autoconnect yes type ethernet ip4 192.168.140.11/24 ip6  2019:ac18:1::101/64

虚拟机RHEL2 与RHEL3通过他们的第三块网卡VMnet13进行连接

RHEL3  ipv4 192.168.245.10  ipv6 2019:ac18:2::100
RHEL3  gw4 192.168.245.11   gw6 2019:ac18:2::101 # 网关配置成RHEL2的
RHEL2  ipv4 192.168.245.11  ipv6 2019:ac18:2::101

命令

[root@rhel2 ~]# nmcli connection add con-name connection23 ifname eno50332216 autoconnect yes type ethernet ip4 192.168.245.11/24 ip6  2019:ac18:2::101/64 
[root@rhel3 ~]#  nmcli connection add con-name connection23 ifname eno50332216 autoconnect yes type ethernet ip4 192.168.245.10/24 gw4 192.168.245.11 ip6  2019:ac18:2::100/64 gw6 2019:ac18:2::101

在RHEL2上开启IPV4与IPV6进行路由转发，并开启防火墙的masquerade

## 临时开启 ipv6转发
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
## 临时开启 ipv4转发
echo 1 > /proc/sys/net/ipv4/conf/all/forwarding
## 永久开启 ipv4转发
vim /etc/sysctl.conf # 增加下面的行
net.ipv4.ip_forward=1

[root@rhel2 ~]# firewall-cmd --add-masquerade
[root@rhel2 ~]# firewall-cmd --add-masquerade --permanent
注：`masquerade` 地址伪装，算是snat中的一种特例，可以实现自动化的snat。

结果

# IPV4
[root@rhel1 Desktop]# ping 192.168.245.10
PING 192.168.245.10 (192.168.245.10) 56(84) bytes of data.
64 bytes from 192.168.245.10: icmp_seq=1 ttl=63 time=8.52 ms
^C
--- 192.168.245.10 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 8.525/8.525/8.525/0.000 ms
# IPV6
[root@rhel1 Desktop]# ping6 2019:ac18:2::101
PING 2019:ac18:2::101(2019:ac18:2::101) 56 data bytes
64 bytes from 2019:ac18:2::101: icmp_seq=1 ttl=64 time=2.64 ms
64 bytes from 2019:ac18:2::101: icmp_seq=2 ttl=64 time=3.34 ms
^C
--- 2019:ac18:2::101 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1003ms
rtt min/avg/max/mdev = 2.649/2.996/3.344/0.351 ms

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原文地址：https://www.cnblogs.com/primadonna/p/11920493.html