Communication between branches

Question

Good day Team 
 l have just deployed a firewall XGS 2300 
 The network has 5 branches which are connected using GRE Tunnels. The communication from branches to HQ is working fine. We have a problem with the communication from one branch office to another branch office. Like we can't use VOIP to call from a branch to another branch. Calling from a branch to HQ is working fine.

emmosophos · Answer

Hello Anesu, 
 Thank you for the follow-up. 
 If for Site A to get to Site B, the traffic needs to pass through the HQ; then you would have a Hub and Spoke environment. 
 If Site A and Site B don&rsquo;t go through the HQ to get to each other, then I am unsure how the Sophos Firewall plays a role here. 
 In any case, you can confirm if the Sophos Firewall is seeing traffic by doing a GUI PAcket Capture or TCPdump by filtering for a computer IP on Site A and one on Site B 
 E.g 
 tcpdump -eni any host 192.168.20.100 and host 192.168.30.100 and ICMP 
 If you see ICMP traffic, then filter for some VoIP ports, such as 5060, this will help you see where you need to start looking to troubleshoot and if the Firewall is dropping/blocking the traffic, or some routing issue in your branches. 
 Regards,

Communication between branches

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