centos6.5 and GRE tunnel

Discussion in 'Mail Chat' started by noobking, Jan 24, 2014.

  1. noobking

    noobking Member

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    Since I upgraded my servers to centos 6.5, all the new GRE tunnel will not work. After digging, I found the output of "ip add" is as follows:

    Code:
    4: gre0: <NOARP> mtu 1476 qdisc noop state DOWN
        link/gre 26.23.18.18 brd 178.178.178.178  (note they are fake IPs)
    5: gretap0: <BROADCAST,MULTICAST> mtu 1476 qdisc noop state DOWN qlen 1000
        link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    For my other servers who are running centos 6.4 and has GRE tunnel working, the output of "ip add" will be

    Code:
    5: gre0: <NOARP> mtu 1476 qdisc noop
        link/gre 0.0.0.0 brd 0.0.0.0
    Compare the outputs and we can clearly see the differences. Is the failure of GRE tunnel due to these differences? I didn't create gretap, how come gretap?

    Thanks in advance!
     
  2. noobking

    noobking Member

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    problem solved
     

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