As soon as you turn on your modem you can see the DHCP REQUEST being sent for an ip address to the nearest DHCP Server(located most probably at your ISP). I hope I have explained the process at least to some level of accuracy, please feel free to comment and correct mistakes……. The address will be registered and once again the ARP will be resolved for knowing MAC addresses(remember we can see frequent arp requests flowing in card, just because of the arp timeouts).The DHCP server will send dhcp offer containing the ip-address for the client.Clients can use SSDP with little or no static configuration.Īhh !!! Now we can see a reply from the dhcp server………. Along side this, the SSDP (sinple service discovery protocol will get the services given by ISP, the main thing to be noted here is that the protocol does not need a defined static IP for this communication, it does with out IP), SSDP provides a mechanism which network clients can use to discover network services.The Netbios-ns protocol will use UDP: 137 and registers itself with the layer-2 network with the host name(Here if I connect my laptop with modem then the name would be my_laptop_kalyan, nothing but the name I gave for my laptop in windows).Secondly there is one more thing happening at this time, the DSL modem will send an IGMPv2 join message to the ISP.īefore I complicate the process with introducing two new protocols let me explain the fact that the DSL modem does hell lot of background process before it acquires an IP for it.In the mean time the Ethernet card(MAC) will not be silent and it will keep on be flooding packets for knowing the MAC address for the immediate port.Firstly the modem will start sending DHCP request and wait for the DCHP offer from the server.Let me walk through the STEP BY STEP path taken by the dsl router before it opens for a full fledged internet access: The frequency of DSL modems is 25 kHz, extending beyond 1MHz, which prevents interference with voice service.įor more understanding, I would recommend to spend few minutes to read the next paragraph, and then go ahead and watch the rest of the page about what is happening deep inside wire. DSL filters are required to be connected to the phone lines so that both can be accomplished without interruption. However, because of the tremendous Internet speed that DSL modems offer, in addition to the ability to use both the telephone and computer simultaneously, many consumers prefer the use of DSL modems. Like voice band modems that are located inside computers, there are also internal DSL modems available (with PCI interface) that are also located inside computers however, internal DSL modems are uncommon.ĭSL modems are basically for specific protocols, because they don't work on all lines even when they are from the same company. Sometimes DSL modems are connected via a USB port. Most DSL modems are outside of the computer and connected via wire to the computer's Ethernet port. DSL modems also receive and demodulate the tones from the DSLAM for the purpose of serving computers. However, it might consist of one for management functions.ĭSL modems transform high-frequency tones to transmit tones to a DSLAM. ADSL modems work as a bridge and do not require an IP address.
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