![]() s - Setting snaplen to 0 sets it to the default of 262144, for backwards compatibility with recent older versions of tcpdump.w - Write the raw packets to file rather than parsing and printing them out.v - When parsing and printing, produce (slightly more) verbose output.After checking the logs for some reasons you didn’t find any issue and you decided to take a tcpdump for further analysis. You have been experiencing connectivity issue since 10 minutes ago. Scenario: You are working as technical engineer at WeRelay Company an SMS aggregator and your partner Mobile Network Operator has an IP of 192.168.10.101. Tcpdump helps you to capture the live traffic for the targeted endpoints, by correctly tuning your capture parameters you will filter and receive the specific packets. Tcpdump to capture the packets and Wireshark to read the saved packets from your tcpdump capture. When all those lead to no resolution it is a time you need to check the issue at the packets level. Having exhausted all other troubleshooting procedures verifying credentials are correct, checking logs, communicate with partner operator, and checking all parameters. When dealing with SMPP Protocol or any other protocols there are time you will face issues that leaves you stuck. This allows these organizations to focus on their areas of business and leave the complexity of messaging to their trusted vendors in this case SMS aggregators. ![]() ![]() Normal applications such as banking applications, hospital management systems or school management systems usually integrate to the SMS aggregators’ HTTP/REST APIs. SMS Aggregators has a special applications called SMS Messaging Gateway that implements the SMPP Protocol and connects to Mobile Network Operators. Most Mobile Network Operators provide SMPP Protocol for integration into their SMSC as a sole or as an additional to other protocols such as SOAP and HTTP/REST. SMPP Protocol: API to enable SMS messaging between applications and mobiles. Troubleshooting SMPP Protocol using tcpdump and Wireshark
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