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Information Technologies Insfrastructure

 

 

 

 

Configuration Tips

When configuring your host to connect to the network for the first time, parameters other than the IP address and hostname may be required. Here are some tips that will apply to most new hosts on dotCIO administered networks. If your IP address looks like "128.113.n.n, you are on a dotCIO network. If your address begins with "128.213.n.n", you are on a network supported by the Computer Science department and will need to contact them for assistance.

If you have difficulty configuring your system, you may want to consider the CUSSP program, for UNIX users or talking with the ARC Consultants. You can also send the ARC consultants by e-mail.

CoreNET or ResNET - a.k.a. Switched Ethernet

ResNET is the Switched Ethernet provided to most Residences on campus. CoreNET is the Switched Ethernet provided to the core campus primarily for class rooms, laboratories and offices. By looking at the third number of the four numbers that make up your IP address you can determine if you are on CoreNET or ResNET. The first and second number "128.113" are known as the "network numbers". The third number is referred to as the "sub-network number". The fourth number is the "host number".

If the third number of your IP address is listed in the table below, you are on ResNET or CoreNET. Otherwise, you are on the normal RPI network.


Sub-net
Switched Ethernet
Location
136-143
ResNET
Bryckwyck, Colonie, Married Housing, Stacwyck
144-151
ResNET
E-Dorm, North Hall, Quad
152-159
ResNET
BARH, Field House, RHAP, Sunset Terrace
160-175
CoreNET
Core Campus, RSDH
192-207
ResNET
Barton, Bray, Commons, Crockett, Davison, Hall, Nason, Nugent, Sharp, Warren

Default Gateway or Router

The default gateway for your host can be determined by looking at the third number of the four numbers that make up your IP address. The first and second numbers "128.113." are known as the "network numbers", the third number is referred to as the "sub-network number", the fourth number is the "host number". If you are not on the CoreNET or ResNET your default gateway address should be "128.113.[your-sub-network-number].254. In other words, if your IP address is "128.113.34.142", your default gateway address will be "128.113.34.254".

If you are part of the CoreNET or ResNET, use the table below to find your Default Gateway Address. For example, the correct gateway for subnet 145 is 128.113.144.254


Sub-net
Default Gateway
136-143
128.113.136.254
144-151
128.113.144.254
152-159
128.113.152.254
160-175
128.113.160.254
192-207
128.113.192.254

Sub-net
Broadcat Address
136-143
128.113.143.255
144-151
128.113.151.255
152-159
128.113.159.255
160-175
128.113.175.255
192-207
128.113.207.255

Sub-network (subnet) Mask

The sub-network mask for machines not connected to the CoreNET or ResNET should be 255.255.255.0, sometimes this may be specified as "FFFFFF00". If you are connected to the CoreNET or ResNET, use the table below to find your Mask. For example, the correct Mask for subnet 145 is 255.255.248.0


Sub-net
Mask
Hex Mask
136-143
255.255.248.0
fffff800
144-151
255.255.248.0
fffff800
152-159
255.255.248.0
fffff800
160-175
255.255.240.0
fffff000
192-207
255.255.240.0
fffff000

 

Domain Name Server

If your host is supported under the CUSSP program, your domain name servers will be set automatically. A number of domain name servers are available on different sub-networks. If there is a domain name server on your sub-network, you should use that one as your primary server. A good choice all around would be to use either dns4 or dns7, which are authoritative for Rensselaer. Your secondary domain name server should be on a different sub-network than the primary, so it would be better not to pick dns3/dns4 as primary and secondary. Consult the list below to see where some of the servers are on the Rensselaer network.


dns4.rpi.edu
128.113.28.67
intrepid.server.rpi.edu
dns7.rpi.edu
128.113.26.77
constellation.server.rpi.edu

Domain Name

The domain name for your host is determined by the fields of the "dotted quad" name after the first field. A typical host name looks like "okeeffe.cis.rpi.edu" this host's name is "okeeffe" and its domain is "cis.rpi.edu". For hosts here at Rensselaer, the last part of the name always ends in .rpi.edu, which may be thought of as the network and the second dotted field, "cis" in this case may be thought of as the "sub-domain". When configuring a host, the term domain usually refers to the entire portion of the hostname after the first field. When a name is specified with all of its parts it is referred to as a "Fully Qualified Domain Name" (FQDN).

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