Unexpect single port disconnection from PA-220

[CharlesWang]

My client's PA 220 cannot reach to his gateway. However, after he has reboot his PA, the connection is back, but only for few hours long! No matter how I have add the MAC address and troubshoot the problem of the system.  I have checked both port on therouter and the port on the PA. I have added the MAC address on the ethernet port. I have even chnaged the port. It doesn't contunuse its connection. I have opened this case for the Paloalto support team, but the support, in his first time support, also thought it's the client's router's problem, but it seems that it might not be the issue there.

[BPry]

@CharlesWang,

Does the firewall actually see the port drop, or do you simply lose internet traffic? Is the connection using a static IP or is it using DHCP or PPPoE? 

[CharlesWang]

1. I pinged the gateway but the gateway didn't respond, and the ethernet is up. In addtion, I cannot even ping the same domain ip addresses. I have tried to change the port, but it occurs the same problem.

2. The port is static IP.

[Raido_Rattameister]

Remove static arp entry.

> clear arp ethernet1/5

And use same command to ping.

> show arp ethernet 1/5

Do you see arp entry for .89?

[CharlesWang]

I have done what you told me, but it's still not able to reach 61.154.70.89