1
vote
2answers
63 views

Concise IP information in OS X Terminal

Is there a command for the OS X Terminal that shows you only the most vital IP configuration information about your machine? I know there is "ifconfig" but that brings up a bunch of (in most cases) ...
0
votes
4answers
112 views

Why my subnet mask is not matching with my IP address?

I have a class 'B' IP address 172.16.XXX.XXX in my machine. My Subnet mask is 255.255.255.XXX. I am studying networking now. So until now I didn't care about masking about all. But from Wikipedia I ...
1
vote
1answer
433 views

Communication possible between 192.168.0.x and 192.168.1.x?

I have a problem I encounter on a regular basis. I have an access point with a fixed 192.168.0.x IP address. My network is 192.168.1.x. The problem is when I plug the access point into my network, it ...
-1
votes
1answer
39 views

routing table, ip address for outgoing packet

Network Destination Netmask Gateway Interface 0.0.0.0 0.0.0.0 192.168.2.1 192.168.2.8 ...
1
vote
2answers
91 views

Why nic with incorrect subnet mask can still ping the gate way?

At first, my network config was like this: $ ip a 2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 3c:97:0e:bd:b1:68 brd ff:ff:ff:ff:ff:ff ...
0
votes
2answers
83 views

What IP's should the servers be assigned? [closed]

I have got 4 subnets (calculated using online calculators) The major network is: 172.16.0.0/16 The students subnet having the highest IP requirement /22 mask gets 172.16.0.1 - 172.16.3.254 as ...
2
votes
3answers
163 views

Broadcast address in IPV4

I have a small network with the subnet mask 255.255.255.240 and the IP range is 192.168.2.1 - 192.168.2.12. From 192.168.2.1, I want to broadcast a packet. I don't want this packet to go anywhere ...
1
vote
1answer
218 views

What is major network mask and subnet mask

I've been served with a question to find Major Network Mask and I've only given Host IP address and sub-net mask. I have to find the Major Network Mask using Host IP and sub-net mask. Another ...
1
vote
1answer
531 views

How to find CIDR subnet for a public Internet IP address?

Usually I do not worry about subnet of an IP address on the public Internet, but after I began using Amazon EC2 firewall, it got me thinking. EC2 firewall configuration requires an IP to be written ...
1
vote
1answer
167 views

Regarding IP subnetting process

Professor taught the following scenario. An organization has purchased a Class-C address 216.21.5.0 and would like to use it to address its offices at Arizona, Florida and California. It has the ...
1
vote
3answers
265 views

Network addressing without wasting IP addresses

I know how to do the classic "network addressing" when I am allowed to waste IP addresses. For example, if I need to hook up 9 computers, I could use a /28 subnet, which allows 16 hosts to be mapped ...
0
votes
0answers
11 views

How to force to use routin than direct connection? [on hold]

How to force to use the routing and not the arp entries? I have second router. So if I ping a gw of this router then I get it's MAC-addr.
0
votes
1answer
165 views

How to force to send data to router (on L3) instead sending directly? (on L2)

I have a public IP-addr on one machine: a.b.c.156/32 The GW is a.b.c.133 (which is in the /27 network with its gateway a.b.c.129) I statically added an arp route: sudo arp -an a.b.c.133 at ...
0
votes
1answer
31 views

Emulate Network address in a LAN

My college has a network, their dhcp will allot us a xx.xx.67.xx ip (Wifi), i found that in their lab they use a different proxy that is restricted for our ip range(Squid) (xx.xx.1.xx is their ip ...
2
votes
2answers
664 views

Is 225.225.225.128 a valid subnet mask?

I have been told that we have two devices on a network: 10.40.225.142 and 10.40.225.144 These devices both have Gateway 10.40.225.129 Subnet mask 225.225.225.128 (note 225 is Not a typo) These ...
0
votes
1answer
118 views

how to take subnet mask for an IP

I found this problem in a textbook, and I do not understand the solution: Find the subnet which the IP: 192.168.1.25 belongs to. Here is what they did: 255.255.255.224 for 192.168.1.25 and do ...
0
votes
2answers
227 views

Splitting and connecting a small subnet

It's been a while since I built out a network so bear with me as I've lost some of the nomenclature. Given "5" usable static IP addresses from our ISP is it possible to use 3 of them for globally ...
0
votes
1answer
383 views

Subnetting an IP address (172.16.0.0/12) into 2 subnets

Say I have the private network address 172.16.0.0/12 and I want to split it into 2 subnets. There are 12 bits used for the network number leaving 20 bit for the host number. I use 1 of these host ...
0
votes
1answer
341 views

Subnetting 90.103.80.0/21 into 8 subnets with at least 250 hosts per subnet

I am studying subnetting and I am not sure if I've got the hang of fully. Here's a question I've answered with my answers posted below it. I am particularly unsure about Question 4. I'd appreciate ...
1
vote
2answers
6k views

192.168.x.x addresses with subnet 255.255.0.0

We are designing a network where we have 192.168.100.52 192.168.110.13 Initially the subnet mask was 255.255.255.0, so clearly these first two machines will not communicate with each other without ...
2
votes
2answers
276 views

Can't connect to Cisco router's settings page

Currently I have a 2 wire modem, and a Netgear WNDR3400. What I want to do is add a Cisco RV100W for its VPN features. Currently the Netgear router is connected to the modem via the WAN port. When I ...
3
votes
1answer
318 views

How to calculate CIDR notation from entries in a routing table

I have some entries in a routing table that were created using longest prefix matching, and I have to use those entries to determine the a.b.c.d/x notation (CIDR). This is an example entry: 11001000 ...
2
votes
1answer
196 views

Is there a way to detect a LAN's IP and its subnet mask?

I'm not a English speaker, but I'll try my best make it clear: If your laptop connects to a unknown local network (through a wireless or wired router) and there's no DHCP service at all, and nobody ...
1
vote
2answers
1k views

Two hosts on same subnet can't see each other

I've got two routers with two separate public IP addresses on the same subnet, but I can't get them to talk to each other. Both are connected to the internet (ISP-provided gateway) via Ethernet ports ...
1
vote
2answers
955 views

Do machines connected to the same switch belong to the same subnet?

When we talk about a subnet - do we mean all the systems connected to the same switch? If I have an assigned IP address of 10.0.2.1, am I in the same subnet as that of 10.0.1.39? When we talk about ...
0
votes
1answer
1k views

using a gateway outside your subnet but on the same switch, with no router

I have set up a network in a non-standard way, and would like to know if what I did is technically correct, or if I just got lucky. The setup works fine with my $20 5-port Linksys switch, but not ...
0
votes
1answer
32 views

I have just created a subnet for a local network, connecting to a standalone server on another network, now I cannot connect to the internet

I am just learning some new aspects of servers and networking. We have a network of 5 subnets that all interconnect with each-other. In order to get two computers on the subnet that we were setting ...
2
votes
2answers
486 views

How does CIDR slow the exhaustion of IPv4?

In the Wikipedia article on CIDR, it says The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous addressing architecture of classful network design in the ...
19
votes
8answers
11k views

Why do we need subnet mask?

Since a IPv4 address already gives the information of the network and and host, why do we still need a subnet mask? The 1st Octet already specify the network class (1-127: A, 128-191: B, 192-223: C ...
3
votes
5answers
2k views

Where are addresses from the network 0.0.0.0/8 used in practice?

I read that this pool: Means "these hosts" in "this network" Is used for self-identification Is used for broadcast messages My questions are: Where exactly these addresses can be found? Which ...
3
votes
2answers
6k views

What is the difference between a subnet mask and a netmask?

Is there any logic in using two different names for determining host ID and net ID? For example, if you type print route in a Command Prompt you get things with netmask, but the IPv4 settings seems ...
2
votes
1answer
489 views

Separate computers in my apartment can't communicate to each other?

In my apartment, the management provides the building with a network connection. I have my computer plugged into the ethernet coming out of the walls, and my friend who also lives in the apartment ...