Basically our setup is a Dell server and a Dell N3000 switch.
Server: Trunk connection to the switch, 2 * 1GB ports bonded (LACP/802.3ad). Two VLANS, one for internet (VLAN 10) and one for voice traffic (VLAN 20). VoIP softswitch installed on the server with two configured interfaces. One on VLAN 10 and one on VLAN 20.
Switch: We have 3 Directly connected carriers that we receive from and relay VoIP to. Each of them with 2 IP addresses each, one for sip and one for media on their respective vlans. (Excluding P2P IPs)
Our job is basically to receive traffic from carrier A and send to Carrier B or carrier C, depending on destination.
We have all necessary Static routes configured and pings work, but when we push SIP traffic (UDP) to a destined carrier, it get's dropped on the switch (Never progresses from VLAN 20). Happens with all connected carriers. I determined this with a packet trace.
The issue persisted until we setup Policy Based Routes on the switch. This fixed it. And also ruled out any Firewall suspicion.
Weird behavior that still baffles me and I'd like to know the root of it. So it doesn't cause me problems in future.
Important to note that I am totally winging all of this, and any reply will be appreciated. Thanks
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