SPMA080 April   2021 TM4C1292NCPDT , TM4C1292NCPDT , TM4C1292NCZAD , TM4C1292NCZAD , TM4C1294KCPDT , TM4C1294KCPDT , TM4C1294NCPDT , TM4C1294NCPDT , TM4C1294NCZAD , TM4C1294NCZAD , TM4C1299KCZAD , TM4C1299KCZAD , TM4C1299NCZAD , TM4C1299NCZAD , TM4C129DNCPDT , TM4C129DNCPDT , TM4C129DNCZAD , TM4C129DNCZAD , TM4C129EKCPDT , TM4C129EKCPDT , TM4C129ENCPDT , TM4C129ENCPDT , TM4C129ENCZAD , TM4C129ENCZAD , TM4C129LNCZAD , TM4C129LNCZAD , TM4C129XKCZAD , TM4C129XKCZAD , TM4C129XNCZAD , TM4C129XNCZAD

 

  1.   Trademarks
  2. 1 Introduction
    1. 1.1 TI-RTOS Download
    2. 1.2 License
    3. 1.3 XDCtools
    4. 1.4 Versions
    5. 1.5 Configuring NDK Modules
    6. 1.6 Socket-Based API
      1. 1.6.1 BSD Style Socket APIs
  3. 2 Application Examples
  4. 3 Application Setup
    1. 3.1 Hardware Setup
    2. 3.2 Software Tools
  5. 4 Download and Import the Ethernet Examples
  6. 5 How to Create an Ethernet Application for TI-RTOS NDK
  7. 6 Enet_tcpecho_server_tirtos Example Overview
    1. 6.1 Build and Flash the Program
    2. 6.2 Check and Program the MAC Address
      1. 6.2.1 Using The LM Flash Programmer
      2. 6.2.2 Using CCS
      3. 6.2.3 Using UniFlash
    3. 6.3 Run the enet_tcpecho_server_tirtos Example
  8. 7 Enet_udpecho_server_tirtos Example Overview
    1. 7.1 Run the enet_udpecho_server_tirtos Example
  9. 8 Enet_httpServer_tirtos Example Overview
    1. 8.1 Configure NDK for HTTP Application
    2. 8.2 Embedded File System (EFS) Operation
    3. 8.3 Adding HTTP Server Content
    4. 8.4 Declaring HTML Files to EFS
    5. 8.5 Writing CGI Functions
    6. 8.6 Run the enet_httpServer_tirtos Example
  10. 9 Enet_dns_tirtos Example Overview
    1. 9.1 How to Configure NDK for DNS
    2. 9.2 How to View the DNS Traffic on Wireshark
    3. 9.3 Run the enet_dns_tirtos Example
  11. 10Enet_sntp_tirtos Example Overview
    1. 10.1 Run the enet_dns_tirtos Example
  12. 11Enet_tcpecho_client_tirtos Example Overview
    1. 11.1 Configure the Server IP Address
    2. 11.2 Configure the SocketTest Server
    3. 11.3 Run the enet_tcpecho_client_tirtos Example
  13. 12Enet_udpecho_client_tirtos Example Overview
    1. 12.1 Run the enet_udpecho_client_tirtos Example
  14. 13Enet_httpget_tirtos Example Overview
    1. 13.1 How to Configure NDK for HTTP GET Example
    2. 13.2 Run the enet_httpget_tirtos Example
  15. 14References

9.3 Run the enet_dns_tirtos Example

As expected, running this example prints the four IP addresses of the corresponding websites on the CCS console window, see Figure 9-3. For more details, look at the Wireshark capture particularly for www.google.com.

  • In the highlighted box 1 and box 2 of the Wireshark capture in Figure 9-4, four DNS packets are observed corresponding to the four websites.
  • The source address of the transaction is from the IP address 192.168.254.254. This happens to be the IP address of the router to which this application is connected. A smart router normally will act as the DNS server and store the past visited domain names in its cache for fast retrieval.
  • In box 3, the returned IP address for www.google.com is 172.217.1.132. You can confirm by typing this address on your browser’s URL field and it should lead you to the Google website.
  • In box 4, the IP address is expressed as a 32-bit binary value equal to 0xACD90684. The 0xAC is equal to decimal 172, the 0xD9 is equal to decimal 217 and likewise for the rest.
GUID-20210329-CA0I-FMNX-QDNT-2MR09RWFWRD5-low.jpgFigure 9-3 Enet_dns_tirtos Output
GUID-20210329-CA0I-S35D-4LHR-L3HTL42MFDH4-low.jpgFigure 9-4 Wireshark Capture for Enet_dns_tirtos