Networking problem after a zone is created and installed

Hi all,
I've got a networking problem after a zone was created and installed on a Solaris 10 box. The box was configured with two NICs, one (e1000g0) with a public IP address, the other one (e1000g1) with a private IP address and connected to a local switch. All worked fine so far.
Then I created a local zone with shared networking (e1000g1). The zone has a private IP address which is in the same subnet as e1000g1 on the global zone. After some time, I noticed that I could not access (ssh, ping) the global zone. Then after some time, the global zone became available. The problem happened quite frequently.
Also I observed that: 1) When the global zone was unavailable from outside, it was available (ssh, ping) from another box within the same subnet (e1000g0); 2) If I shutdown e1000g1, the problem was gone.
Any idea what caused this problem?
Many thanks,
Xiaobo

It was a route problem.

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