Mac配置：Mac通过USB无线网卡连接外网，还有一个有线网口
目标：共享Mac无线网络，让另一台路由连接Mac有线网，上外网
步骤：
- Make sure the 2nd router is off for now
- Go to Dock/Finder–>Preferences–>Sharing
- (Assuming OSX 10.7＋) Highlight the 2nd-to-last option (Internet Sharing)–>Select ‘Wi-Fi’ from the ‘Share your connection from’ drop-box
- Click the check-box next to ‘Ethernet’ in the ‘To computers using:’ section and click the check-box next to ‘Internet Sharing’ to finally enable it.
- Connect the ethernet cable from your Mac to your router’s WAN/Internet port and turn your 2nd router on.
Assuming that 2nd router is set up for DHCP it should now see your ethernet-connected Mac as its gateway and use it as its internet source.
这样设置之后，会生成/etc/bootpd.plist
$ cat /etc/bootpd.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Subnets</key>
<array>
<dict>
<key>_creator</key>
<string>com.apple.NetworkSharing</string>
<key>allocate</key>
<true/>
<key>dhcp_domain_name_server</key>
<array>
<string>192.168.2.1</string>
</array>
<key>dhcp_router</key>
<string>192.168.2.1</string>
<key>interface</key>
<string>bridge100</string>
<key>lease_max</key>
<integer>86400</integer>
<key>lease_min</key>
<integer>86400</integer>
<key>name</key>
<string>192.168.2/24</string>
<key>net_address</key>
<string>192.168.2.0</string>
<key>net_mask</key>
<string>255.255.255.0</string>
<key>net_range</key>
<array>
<string>192.168.2.2</string>
<string>192.168.2.254</string>
</array>
</dict>
</array>
<key>bootp_enabled</key>
<false/>
<key>detect_other_dhcp_server</key>
<array>
<string>bridge100</string>
</array>
<key>dhcp_enabled</key>
<array>
<string>bridge100</string>
</array>
<key>dhcp_ignore_client_identifier</key>
<true/>
<key>ignore_allow_deny</key>
<array>
<string>bridge100</string>
</array>
<key>use_server_config_for_dhcp_options</key>
<false/>
</dict>
</plist>
可以通过如下命令启动／关闭dhcp服务
sudo launchctl load -w /System/Library/LaunchDaemons/bootps.plist sudo launchctl unload -w /System/Library/LaunchDaemons/bootps.plist配置bootptab设置为路由配置固定IP地址
$ cat /etc/bootptab %% # machine entries have the following format: # # hostname hwtype hwaddr ipaddr bootfile newifi-wan 1 EC:0E:C4:0F:EA:79 192.168.2.100看看路由
$ netstat -nr Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 172.22.152.1 UGSc 27 7247 en2 default link#7 UCSI 0 0 bridge1 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 4 325589 lo0 169.254 link#6 UCS 0 0 en2 172.22.152/23 link#6 UCS 0 0 en2 172.22.152.1/32 link#6 UCS 1 0 en2 172.22.152.1 a4:93:4c:89:c6:4b UHLWIir 27 0 en2 786 172.22.152.55/32 link#6 UCS 0 0 en2 192.168.2 link#7 UC 1 0 bridge1 192.168.2.100 ec.e.c4.f.ea.79 UHLWIi 3 264 bridge1 1170
ifconfig 可以看到多了一个bridge100
bridge100: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=3<RXCSUM,TXCSUM>
ether c6:34:6b:42:de:64
inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255
inet6 fe80::c434:6bff:fe42:de64%bridge100 prefixlen 64 scopeid 0x7
Configuration:
id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
ipfilter disabled flags 0x2
member: en0 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 4 priority 0 path cost 0
nd6 options=1<PERFORMNUD>
media: autoselect
status: active