在多网卡的情况,ping发出和回复可以在不同的网口。但是telnet必须要求同一个网口
Find one UE can telnet but telnet fail. Also fail to open TL1(oam interface).
Becuase telnet successful from same subnet, find root cause is routing table.
root cause:
ping can reply from another interface, and it would work, but telnet can only work with same interface.