ICSI Netalyzr

Netalyzr is a java applet developed by ICSI which will let you do a whole bunch of Internet connectivity tests. This can be used to determine the Internet connection status of a machine, including NAT, firewall rules, DNS resolver and much more, which can be very helpful in debugging a PERT case. Netalyzr currently supports the following tests:

* NAT Detection (internal/external IP address)
* DNS based host information (Tor/Spamhaus/SORBS DHUL)
* outbound TCP reachability (FTP, SSH, SMTP, DNS, HTTP, POP3, RPC, NetBIOS, IMAP, SNMP, HTTPS, SMB, SMTP/SSL, secure IMAP, authenticated SMTP, IMAP/SSL, POP/SSL, remote SIP server, BitTorrent Server)
* outbound UDP reachability (DNS, MSSQL (port 1434)
* Path MTU discovery
* Network latency measurement
* TCP connection setup latency
* Network background health measurement
* Network bandwidth measurements Upload/Download
* Network buffer measurements
* HTTP proxy detection (address-based/header-based/malformed requests)
* Filetype-based filtering (HTTP cache)
* Javascript-based tests
* domain DNS lookup (restricted/unrestricted)
* Direct EDNS support
* DNS resolver address
* DNS resolver properties
* DNS glue policy
* DNS resolver port randomization
* DNS lookups of popular domains
* DNS external proxy
* DNS results wildcarding
* system clock accuracy
* Browser properties
* Uploaded Data

Here are some screenshots of the applet, so you get a feeling what it looks like:

  • Netalyzr Result Summary:

  • Netalyzr Expanded Summary:

  • Netalyzr Client Transcript:

  • Netalyzr Server Transcript:

-- ChrisWelti - 15 Jan 2010 - 18 Jan 2010

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Netalyzr-expanded-summary.png r1 manage 143.1 K 2010-01-15 - 17:05 ChrisWelti Netalyzr Expanded Summary
PNGpng Netalyzr-result-summary.png r1 manage 125.7 K 2010-01-15 - 17:04 ChrisWelti Netalyzr Result Summary
PNGpng Netalyzr-transcript-client.png r1 manage 236.9 K 2010-01-15 - 17:14 ChrisWelti Netalyzr Client Transcript
PNGpng Netalyzr-transcript-server.png r1 manage 123.1 K 2010-01-15 - 17:14 ChrisWelti Netalyzr Server Transcript
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Topic revision: r2 - 2010-01-18 - ChrisWelti
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