Tag Archives: network

Server flood automatic detection

My current customer develops embedded devices used by many end users. In order to save server load devices use multicasts for downloading data: every device registers itself on multicast channel using IGMP and listens to UDP packets. No connections to … Continue reading

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Google.com performance analysis over few years

Time is money. No doubt about that. The more time your customer waits for your service response the less coins may hit your pocket. You may ask: why? If your page loading is too slow your "almost" customer hits back … Continue reading

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HTTP(S) exchange analysis using Wireshark

Wireshark is a tool that allows to scan network packets and make analysis of network connection without direct access to server or client. Today we will show simple method to analyse TCP connections using this tool. TCP connection is composed … Continue reading

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Use tcpdump to sniff HTTP requests

Sometimes you are interested if the software issues proper HTTP requests to the server. You have three options here: checking client logs and assume all HTTP requests are reported checking server logs to see what have been issued using tcpdump … Continue reading

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allegro.pl connection problems – detailed analysis

I've just observed I cannot reach allegro.pl site. Let's check what has failed (this time). First of all, let's check ICMP availability: $ ping allegro.pl ping: unknown host allegro.pl Ops, looks like something wrong with DNS, confirmation below: $ dig … Continue reading

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