logging in or signing up TWNIC cable YiLee Savina Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 249 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 26, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript IP Assignment Procedure for Cable Modem & ADSL: IP Assignment Procedure for Cable Modem & ADSL Yi Lee Seednet 90/06/13Two-way Cable Modem: Two-way Cable Modem As per DOCSIS standards, Two-way cable modem must obtain one IP by DHCP to finish the registration CPE obtains one IP by DHCP in order to access Internet ==>One subscriber needs at least 2 IPs to utilize the cable internet serviceTelco-Return Cable Modem: Telco-Return Cable Modem Telco-return Cable Modem needs 2 IPs to get on-line, one for its RF interface and the other for its PPP interface CPE needs 1 IP to access Internet ==>One telco-return subscriber needs at least 3 IPs to get on-lineCurrent Practice (Cable Modem): Current Practice (Cable Modem) Private IP is assigned to each cable modem’s RF interface Due to common share of RAS by telco-return subscribers and dial-up subscribers, 1 public IP is assigned to each telco-return CM’s PPP interface In both cases(two-way and telco-return), CPE is assigned 1 public IPCurrent Practice (cont.): Current Practice (cont.) Each CMTS is assigned /24 in the “bootstrap” stage for ease of management Another /24 is assigned to the CMTS if IP utilization is over 80% Seednet keeps track of subscriber’s usage record for at least 6 months due to the requirement of law enforcement agency in TaiwanADSL: ADSL 3 different service types in terms of IP usage are supported by current ADSL technologies Dynamic IP -- Subscriber is assigned 1 IP when on line and releases it when off line, suitable for residential users. 1 static IP -- Subscriber is assigned 1 static IP, suitable for SOHO or professional users. ADSL (cont): ADSL (cont) Fixed IP Block -- Subscriber is assigned a block of IP (/27 or more), suitable for business users.Current Practice (ADSL): Current Practice (ADSL) Residential subscriber is assigned 1 dynamic IP by PPPoE with ATU-R running in the bridge mode. Professional subscriber is assigned 1 static IP with ATU-R running in the bridge mode Business subscriber is assigned 8 static IPs (/29) with ATU-R running in the router modeCurrent Practice (ADSL): Current Practice (ADSL) Supporting information like 073 form and purchase receipt is required for business subscriber applying for /28 or /27.Issues: Issues It‘s difficult for ISP to project the IP address consumption The usage pattern generated by users is different ADSL/Two-way cable users are always on-line Telco-return cable users are quite similar with dial-up users in that they tend to be off-line after finishing internet activities.Issues (cont): Issues (cont) It’s more common for a residential subscriber to have more than one CPE More PPPoE or DHCP sessions are requested per subscriber More leased-line users switch to ADSL but want to keep the IP blocks previously assigned from lease-line. Issues (cont): Issues (cont) Publishing residential user information onto the Whois database put ISPs into the risk of violating the privacy lawSlide13: Any Question? You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
TWNIC cable YiLee Savina Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 249 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: November 26, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript IP Assignment Procedure for Cable Modem & ADSL: IP Assignment Procedure for Cable Modem & ADSL Yi Lee Seednet 90/06/13Two-way Cable Modem: Two-way Cable Modem As per DOCSIS standards, Two-way cable modem must obtain one IP by DHCP to finish the registration CPE obtains one IP by DHCP in order to access Internet ==>One subscriber needs at least 2 IPs to utilize the cable internet serviceTelco-Return Cable Modem: Telco-Return Cable Modem Telco-return Cable Modem needs 2 IPs to get on-line, one for its RF interface and the other for its PPP interface CPE needs 1 IP to access Internet ==>One telco-return subscriber needs at least 3 IPs to get on-lineCurrent Practice (Cable Modem): Current Practice (Cable Modem) Private IP is assigned to each cable modem’s RF interface Due to common share of RAS by telco-return subscribers and dial-up subscribers, 1 public IP is assigned to each telco-return CM’s PPP interface In both cases(two-way and telco-return), CPE is assigned 1 public IPCurrent Practice (cont.): Current Practice (cont.) Each CMTS is assigned /24 in the “bootstrap” stage for ease of management Another /24 is assigned to the CMTS if IP utilization is over 80% Seednet keeps track of subscriber’s usage record for at least 6 months due to the requirement of law enforcement agency in TaiwanADSL: ADSL 3 different service types in terms of IP usage are supported by current ADSL technologies Dynamic IP -- Subscriber is assigned 1 IP when on line and releases it when off line, suitable for residential users. 1 static IP -- Subscriber is assigned 1 static IP, suitable for SOHO or professional users. ADSL (cont): ADSL (cont) Fixed IP Block -- Subscriber is assigned a block of IP (/27 or more), suitable for business users.Current Practice (ADSL): Current Practice (ADSL) Residential subscriber is assigned 1 dynamic IP by PPPoE with ATU-R running in the bridge mode. Professional subscriber is assigned 1 static IP with ATU-R running in the bridge mode Business subscriber is assigned 8 static IPs (/29) with ATU-R running in the router modeCurrent Practice (ADSL): Current Practice (ADSL) Supporting information like 073 form and purchase receipt is required for business subscriber applying for /28 or /27.Issues: Issues It‘s difficult for ISP to project the IP address consumption The usage pattern generated by users is different ADSL/Two-way cable users are always on-line Telco-return cable users are quite similar with dial-up users in that they tend to be off-line after finishing internet activities.Issues (cont): Issues (cont) It’s more common for a residential subscriber to have more than one CPE More PPPoE or DHCP sessions are requested per subscriber More leased-line users switch to ADSL but want to keep the IP blocks previously assigned from lease-line. Issues (cont): Issues (cont) Publishing residential user information onto the Whois database put ISPs into the risk of violating the privacy lawSlide13: Any Question?