We have connected two networks into a switch from SonicWALL.
1.Sonicwall X0 (DHCP)-------this is for Computers.
2.Sonicwall X2 (StaticIP) ------ For IP phones.
Here the computer will get DHCP from the firewall , IP phones and PBX are configured on static IP mode.
Some we use a single port of switch for IP Phones and Computer (from phone will connect to computer)
We not configured any vlan in switch until now. we are using cisco Sg300 switch (managed) with L2 mode.
The above setup was working fine for the last 4 years. Suddenly we start facing an issue with computer internet access. The computer can't able to communicate with the firewall or internet. But the computer can locally communicate with other local computers in the same network.
Also note, when the issue occurs some computers work fine.
We made a packet capture on...