Disclaimer: Please contact Sophos Professional Services if you require assistance with your specific environment.
This guide describes network and connectivity issues and the possible remediation.
The following sections are covered:
Most of the connectivity-related issues arise at the following levels:
Summary: Check cabling, ports for damage, signal strength, hardware, power, and driver-related issues.
Summary: Switches/Hubs/Routers are responsible for allowing local connectivity first if physical connectivity is ruled out.
Source NAT is responsible for allowing corporate’s internal devices to reach the internet without having to purchase additional public IP addresses or connections for each individual device, whereas NATting is done for the internal device so they can reach out to the internet.
Destination NAT is used to allow users from the internet to utilize an organization's server which is located in their internal network without having to pay for a static IP address. It can also help map multiple servers to a single static IP address, for example, DHCP, DNS, Web, VPN, File, FTP, and so on can be mapped to one single public IP address.
Summary: Switches handle the delivery of packets to individual devices, thereafter some devices turn on the identification of each device across the local network on a predefined configuration. It is also the foundation for connectivity to internet services.
This allows fine-grained control over intranet and internet communication.
Summary: A firewall consists of various security controls and network features, NAT, route, firewall policies/rules, and VPN. It can also act as a DHCP, DNS, Gateway, Switch, or UTM, all of which require a review for potential misconfiguration. For root cause analysis, firewall logging is a must. Firewalls also support packet capture and verbose debugging for in-depth analysis.
netsh int ip reset
netsh winsock reset
Sophos Firewall documentation
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