Find your dns server istumbler software#
Find your dns server istumbler mac#

You can run IPM without parameters to get a quick list of the available options or run it with help option ('ipm -h') to see a more comprehensive list of options and usage. In order to use ipm, you may need to specify the whole path or add the /usr/bin directory to your PATH. On the Cardinal servers, IPM is located at: /usr/bin/ipm. IPM is available on the Cardinal servers maintained by the FarmShare team.

Find your dns server istumbler mac#

Note that the MAC addresses do not have to be entered in NetDB IPM gathers the association between MAC addresses and IP addresses directly from the routers. IPM (short for 'IP Media') is a command line tool that LNA's can use to query this database about IP and MAC addresses used on the Stanford network, including the date/time an IP or MAC address was first and last seen. Network Engineering 'harvests' these ARP caches ever 4 hours and compiles the information into a database. IPMĪll routers maintain ARP caches which associate IP and MAC addresses. Wireshark, an open source network analysis tool, is the de facto standard packet capture and analysis tool. The 'host', 'dig', and 'nslookup' commands are useful tools for verifying DNS information. As of this writing, Stanford does not support any sort of campus-wide dynamic DNS. LNAs create NetDB records for each host, which is periodically uploaded to the DNS servers. NetDB is the primary interface for DNS at Stanford.

Clients which make dozens of DHCP requests per hour usually have some sort misconfiguration and should be investigated. Report from DHCP servers Dusk and Dawn on the number of DHCP requests for given clients.An example of the results from this query is shown here. The ability to query the DHCP servers for a particular client.Use this report to see if a particular network's roaming pool is being over- or under-utilized. A report on the Roaming address utilization.Network Engineering provides a number of reports on DHCP usage:

Because of this, any user who frequently connects to a building's wired network should be assigned an IP address as for 'Normal DHCP' below. With the exception of the campus wireless networks, the number of roaming addresses is usually quite limited.Thus roaming and normal DHCP are not exclusive. If IP addresses are entered, a device will be given these IP addresses (if appropriate for that network) as per normal DHCP, and in addition, be assigned a roaming address in other locations. It is not necessary to enter an IP address.The device's MAC address must be entered in NetDB, and the DHCP and Roaming checkboxes must be selected.Most laptops should have the 'roaming' checkbox in NetDB enabled for all their interfaces most desktop will not need it. Typically, this will be the manner for assigning addresses on the wireless network. Roaming: Users with Roaming access, when not on a network where their registered IP address(es) reside, will receive a random address from the local network's 'roaming pool', a set of addresses available for infrequent users defined by that network's LNA.

Having multiple IP addresses is appropriate for users who have offices or labs in more than one campus building.

Note that it is possible to bind more than one IP address to a given MAC address and have both available via DHCP.

Checking the 'Roaming' box for this MAC address will also allow the device to obtain roaming addresses on other campus networks where roaming has been enabled.

The device MAC address must be entered in NetDB, the DHCP option must be selected, and one or more valid IP address for the 'home' network must be specified for the MAC address.

(In other words, although the address is distributed via DHCP, the host receives the same address each time.) Typically, this will be the method used for connecting to the local Ethernet 'wired' network.

Normal DHCP: In this case, the device will receive one of the registered IP address if it is appropriate for the network where they are connected.

Wireless and wired roaming DHCP addresses have lease times of less than 1 hour. As per the DHCP spec, hosts will renew the lease halfway through this interval. The DHCP lease time for typical hosts is 2 days. You should not run your own departmental DHCP servers without first consulting with Network Engineering, as improperly configured DHCP servers can disrupt network connectivity for yourself and other groups. For the most part, at Stanford, publicly routed DHCP addresses are only provided to those hosts whose MAC addresses are entered in NetDB.

Find your dns server istumbler software#

Stanford University uses the Internet Software Consortium's package for DHCP (Dynamic Host Configuration Protocol) services. The Departmental Network Engineering group uses many software packages and tools for network analysis and troubleshooting.