Without knowing the subnet mask, we can't know whether something is all ones or not. The definition of broadcast address is 'all ones' in the host field. The concept of a broadcast address is purely dependent on the subnet. It is worthy to understand the concept of 'broadcast' and 'network' subnet address. I say 'node' because 'host' implies that the host is sharing resources I digress. This is specified in the TCP/IP configuration of each NIC for every node on a subnet. As DHCP server, the router assigns IP addresses to each node on the entire subnet for which it has been specified as primary DHCP server. Now, the gateway / router can be configured to act in either DHCP server or primary DNS server (or both roles. The only thing the modem sees is the IP address of the gateway / router this is typically 192.168.0.1 this can be configured to be any valid IP address available. The IP address of the modem is assigned by the IP leasing schema of the ISP. The primary gateway, i.e., router, is often configured to act as primary DNS server for the LAN. CIS offers its own DNS servers also.įor home LAN, there will be a modem that iinterfaces with a gateway, i.e., router. There are other DNS serviers that can be utilized instead, e.g., OpenDNS. Your ISP has at least two DNS servers that are authoritative for it. Your initial question was wide ranging and contained a lot of 'in-the-know' content (so bear with my bloviating response).ĭNS is resolved via UDP protocol to authoritative DNS servers on port 53. Once you have had the subnetting epiphany, you'll mercilessly (and ceaselessly) kick yourself for being so stupid not to have seen what's so plainly obvious that an infant can grasp it. However, that being said, allow me to be so bold to provide some edification concerning this issue what follows is because you mention tools not commonly known w/respect to network troubleshooting with respect to the unedified. SO, I'm utterly unclear what this UDP protocal (DNS) is doing on the highest port you mention. I can only vouch for v5.1135 (my understanding of v1142 w/'secure DNS' is non-existant). Ronny beat me to the most succinct, albeit utterly un-edifying reply I operate on the principles of why use merely 25 words when 100x that many would do as well?ĭNS is domain name service and is necessary for IP address resolution of URL.

Hack router port 5355