What do you mean Source Netmask & Destination Netmask ?

Question

This quostion is for hardware & networking engineers.

Answer 1

Your router has a WAN port and a LAN port.

The router is fed from an ISP which is the source IP address, source network mask, and source default gateway. If you have a dynamic IP from your provider (most households and many busineses do), you set your router to obtain these automatically and that is all you need to do. If you have a static WAN IP then you manually set these in when you configure the router and your ISP will provide these.

The router also is set up to respect a given private LAN IP subnet which includes the LAN IP addresses, LAN subnet mask, and LAN default gateway. If you configure the router to provide LAN IP via DHCP, then this is automatically configured by the router to use the subnet you define and all downstream devices obtain their IP, subnet mask, default gateway, and DNS via DHCP from the router. These would be the destination IP, Destination Subnet Mask, etc.

On household and small networks, there is only one LAN subnet where the first 3 sections of the IP address is always the same (e.g. 192.168.1.x or 192.168.2.x, etc), the default gateway is usually the router (can be a server if server provides DHCP in place of the router doing this), and most often the subnet mask is the default class c 24 bit subnet of 255.255.255.0.

Answer 2

Source Netmask

Answer 3

First,
A I assume that by "netmask" you really mean "subnet mask." A subnet mask is used to break an IPv4 address into two parts, a number that is the network ID and a number that is the HostID.

When a TCP/IP session is analyzed, it's common to refer to the endpoint that initiated the session as the "Source" and the endpoint that received those initial packets as the "Destination."