Network Topology Map

• Hosts
• Switches
• Hubs and unmanaged switches
• VLAN membership report

• Everything in blue color is a link, this includes the text in the image as well! Play with it.
• Please note that VLANId/Name, MAC, IP, SwitchInfo and NetBIOS information on this page has been sanitized in order to avoid leaking private information to you (incase you're a search engine).
• The sanitization-process is automatic for this page.
• The manufacturer part of the OID (MAC) has been kept however.
• VLAN membership, port settings, hub-connectivity is from original data.
• Also please note that the term "hub" means hubs, bridges, multiport-repeaters and unmanaged switches as well as virtual switches inside physical hosts. In short, any network device which appears Layer 2 transparent but doesn't contain the SNMP BRIDGE-MIB.
• Port numbers are in red. On inter-switch links they should be self-evident. On hubs the switch port number is moved to the hub-end of the link to avoid cluttering the immediate vicinity of the switch with overlapping test (graphviz limitation).
• Link speeds are in Mbps in green. Also style of the link line depends on the speed. Since graphviz doesn't support line widths for PNG output, only three styles are available.
• Hubs have xN-text where N means the number of links on hub at the moment of information collection.
• Switches have N/M-text where N means number of ports up (including aggregate virtuals) out of maximum number of ethernet ports on switch.

• Utilizes single-vlan MAC-tables (the old kind) from managed switches/bridges by using NET snmp-tools (due to lack of interest, external programs are used for SNMP-retrieval).
• Detects virtual hosts based on their allocated OIDs (MS, Xen and VMWare) and tries to group them under the physical host if possible.
• "Detects" unmanaged L2-devices ("hubs") based on imperfect knowledge-elimination.
• Builds interswitch topology without CDP/LLDP/STP (uses only BRIDGE-MIB).
• Uses graphviz for buggy layout and output (due to lack of time custom layout/graph engine was not implemented).
• Supports VLAN-information retrieval via qBridge-MIB (if present on switches). VLAN information propagated to unmanaged devices and hosts.
• Displays manufacturer name for NIC/MACs if possible.
• Detects IP-aliases on hosts.
• Printable output (when map-image printed on a separate page) but also easy navigation in browsers (everything is linked).
• Limited detection of port aggregations (no std MIB for this).
• NetBIOS host and workgroup/domain reporting (via nbtscan and postprocessing).
• Uses 2x-rendering technique with ImageMagick's convert post processing with sinc-filter to create anti-aliasing (graphivz doesn't support antialiased graphics). Running convert takes 90% of all runtime at graph generation. Obviosuly this causes some extra headaches wrt integrated cmap which is used to tell your browser where to jump when you select a switch or a hub in the image.
• Custom L2/L3 asynchronous throttled network scanning (using Linux raw sockets and custom socket filter rules, without libpcap or external programs/libs). Avoids hitting broadcast-limits on switch ports. Also avoids hitting the glass-ceiling of Linux ARP-table limitations.
• Three separate programs: collection, optional sanitization, analysis and graph/html generation. This means that collection can be separated on remote hosts.
• Outputs obsolete HTML (too lazy to CSS/XHTML-ify it).
• 3815 Python and 1308 C source code lines (SLOC-lines, comments not counted in).
• No GPL/LGPL/BSD/External code included in any programs (no licensing/usage issues, for me that is).
• Result of two weeks of pain (due to graphviz and imperfect information available inside switches).

• VLAN_005YE(433)
• VLAN_Ff4G8(1419)
• VLAN_odkku(2827)
• VLAN_Mbapd(2932)
• VLAN_brq7Y(3079)
• VLAN_TXOql(3562)
• VLAN_Qjmlq(3783)