freebsd下用ifconfig更改网卡ip地址后是否要重启动?

ohai

不退出多用户模式能立即生效吗？

ohai

可是我更改IP后就ping不通外部了.这是怎么回事啊？

ohai

系统刚刚启动时,ip地址为192.168.0.21

1. 
   
2. bsd# ifconfig vr0
   
3. vr0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>; mtu 1500
   
4.         inet 10.0.6.21 netmask 0xffffff00 broadcast 10.0.6.255
   
5.         inet 192.168.0.21 netmask 0xffffff00 broadcast 192.168.0.255
   
6.         ether 00:05:5d:e2:e0:fa
   
7.         media: Ethernet autoselect (100baseTX <full-duplex>;)
   
8.         status: active
   
9. 
   
10. bsd# ping -c 2 192.168.0.2
    
11. PING 192.168.0.2 (192.168.0.2): 56 data bytes
    
12. 64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=0.906 ms
    
13. 64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.797 ms
    
14. 
    
15. --- 192.168.0.2 ping statistics ---
    
16. 2 packets transmitted, 2 packets received, 0% packet loss
    
17. round-trip min/avg/max/stddev = 0.797/0.852/0.906/0.054 ms
    

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更改IP地址,将192.168.0.21改为192.168.0.3

1. 
   
2. bsd# ifconfig vr0 192.168.0.21 delete
   
3. bsd# ifconfig vr0 192.168.0.3/24 alias
   
4. bsd# ifconfig vr0
   
5. vr0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>; mtu 1500
   
6.         inet 10.0.6.21 netmask 0xffffff00 broadcast 10.0.6.255
   
7.         inet 192.168.0.3 netmask 0xffffff00 broadcast 192.168.0.255
   
8.         ether 00:05:5d:e2:e0:fa
   
9.         media: Ethernet autoselect (100baseTX <full-duplex>;)
   
10.         status: active
    

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为什么ping不通呢,是不是我改的方法不对?

1. 
   
2. bsd# ping -c 2 192.168.0.2
   
3. PING 192.168.0.2 (192.168.0.2): 56 data bytes
   
4. ping: sendto: No route to host
   
5. ping: sendto: No route to host
   
6. ^C
   
7. --- 192.168.0.2 ping statistics ---
   
8. 2 packets transmitted, 0 packets received, 100% packet loss
   

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i2era

直接该即可
不用del也不用alias
#ifconfig vr0 192.168.0.3/24 up

ohai

还是不行啊.

1. 
   
2. bsd# ifconfig vr0 192.168.0.3 up
   
3. bsd# ping 192.168.0.2
   
4. PING 192.168.0.2 (192.168.0.2): 56 data bytes
   
5. ping: sendto: No route to host
   
6. ping: sendto: No route to host
   
7. ^C
   
8. --- 192.168.0.2 ping statistics ---
   
9. 2 packets transmitted, 0 packets received, 100% packet loss
   
10. bsd#
    

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i2era

先ifconfig vr0 down
在ifconfig vr0 192.168.0.3/24 up

ohai

还是ping不通.如果再改回启动时的IP就能通。不知道怎么回事.

1. 
   
2. bsd# ifconfig vr0 down
   
3. bsd# ifconfig vr0 192.168.0.3/24 up
   
4. bsd# ping 192.168.0.2
   
5. PING 192.168.0.2 (192.168.0.2): 56 data bytes
   
6. ping: sendto: No route to host
   
7. ^C
   
8. --- 192.168.0.2 ping statistics ---
   
9. 1 packets transmitted, 0 packets received, 100% packet loss
   

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如果改成启动时的IP就能通.

1. 
   
2. bsd# ifconfig vr0 192.168.0.21/24 up
   
3. bsd# ping 192.168.0.2
   
4. PING 192.168.0.2 (192.168.0.2): 56 data bytes
   
5. 64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=2.382 ms
   
6. 64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.829 ms
   
7. ^C
   
8. --- 192.168.0.2 ping statistics ---
   
9. 2 packets transmitted, 2 packets received, 0% packet loss
   
10. round-trip min/avg/max/stddev = 0.829/1.606/2.382/0.776 ms
    
11. bsd#
    

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i2era

ping: sendto: No route to host  ?
把你改之前，改之后的
#netstat -nr
贴出来

ohai

都一样啊
这是系统启动时的(通的)

1. 
   
2. bsd# netstat -rn
   
3. Routing tables
   
4. 
   
5. Internet:
   
6. Destination        Gateway            Flags    Refs      Use  Netif Expire
   
7. 127.0.0.1          127.0.0.1          UH          2      354    lo0
   
8. 192.168.0          link#1             UC          1        0    vr0
   
9. bsd#
   

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这是改成192.168.0.3时的(不通的)

1. 
   
2. bsd# netstat -rn
   
3. Routing tables
   
4. 
   
5. Internet:
   
6. Destination        Gateway            Flags    Refs      Use  Netif Expire
   
7. 127.0.0.1          127.0.0.1          UH          2      354    lo0
   
8. 192.168.0          link#1             UC          0        0    vr0
   
9. bsd#
   

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