안녕하세요.

가입하고 처음 글을 올립니다.

제가 겪고 있는 문제는 다름이 아니라, 워크스테이션에 CentOS를 설치해서 서버로 운영하고자해서 OS를 설치했습니다.

minimal 설치인지라, 설치 후 수동 네트워크 설정이 필요해 작업을 했는데요...

[root@workstation ~]# uname -a
Linux workstation.XXXXX 2.6.32-504.el6.x86_64 #1 SMP Wed Oct 15 04:27:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[root@workstation ~]# ifconfig

em1       Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX
          inet addr:aaa.bbb.ccc.xxx  Bcast:aaa.bbb.211.255  Mask:255.255.252.0
          inet6 addr: XXXX::XXXX:XXX:XXXX:XXXX/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12465754 errors:0 dropped:0 overruns:0 frame:0
          TX packets:238 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1507354446 (1.4 GiB)  TX bytes:35268 (34.4 KiB)
          Interrupt:16

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1316 (1.2 KiB)  TX bytes:1316 (1.2 KiB)

[root@workstation ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever

2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff
    inet aaa.bbb.ccc.xxx/22 brd aaa.bbb.211.255 scope global em1
    inet6 XXXX::XXXX:XXXX:XXXX:XXXX/64 scope link
       valid_lft forever preferred_lft forever

3: em2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff

[root@workstation ~]# vi /etc/sysconfig/network-scripts/ifcfg-em1
DEVICE=em1
HWADDR=XX:XX:XX:XX:XX:XX
TYPE=Ethernet
UUID=7337edf4-f9f0-4dab-9d3d-6f031e7180cc
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
BROADCAST=aaa.bbb.211.255
IPADDR=aaa.bbb.ccc.xxx
NETMASK=255.255.252.0
NETWORK=aaa.bbb.156.5
DNS1=aaa.bbb.10.2
DNS2=168.126.63.1
IPV6INIT=no
ARPCHECK=no

[root@workstation ~]# service network restart
Shutting down interface em1:                               [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface em1:                                 [  OK  ]

[root@workstation ~]# vi /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=workstation.XXXXX
NETWORKING_IPV6=no

제가 있는곳이 학교 내부인데요, 내부 네트워크에서, SSH는 되는데 Workstation에서 외부로 인터넷 연결은 안됩니다.

구글링해가며 방법을 찾아봤지만 아직 해결을 못한 상황이네요..

같은 글을 stack overflow에도 올렸는데, 그쪽에서는 dhcp 설정이 안된거같다고 얘길했습니다. 

현재 상태에서 인터넷이 안되는 이유라도 알고 싶네요

여러분의 도움을 바랍니다.

감사합니다.