-1
votes
2answers
52 views

What is this router's IP address(es)? [closed]

What is the IP address(es) of the router in my picture? In my picture, you can see that I have question marks next to the router's interfaces, because I'm not sure if those are right. Can someone ...
1
vote
2answers
43 views

Clients on Local Network — simple test?

I am developing a web system for my school (it's in PHP, but that's not important). The system needs to have different behaviors depending on whether or not the user is on the school network ...
3
votes
3answers
215 views

Why does operating system need to know subnet mask? [duplicate]

If I understand correctly, the operating system gets subnet mask together with IP and other stuff from the DHCP server. And this subnet mask seems to be important for router because it knows if packet ...
-1
votes
1answer
232 views

How to connect devices behind Comcast router/modem with devices behind wireless router [closed]

I know this is going to seem like a simple solution but I have been unable to find a clear answer through Google. Simple office setup: I have a Comcast modem/router that has 4 hard wired ports. In ...
0
votes
2answers
90 views

Controlling 2 DHCP servers in one network

In my customer network, we have 2 DHCP servers. One is fully controlled by me and another by a different vendor. I want to make sure a set of devices (my devices) when connected, should get IP address ...
-2
votes
2answers
165 views

How to programmatically determine dynamic IP from behind a subnet [duplicate]

Sorry for the noob question, but I'm trying to hack together an ad hoc dynamic dns to reliably connect two machines in different geographic regions. My issue is every command I try (ifconfig, ...
-1
votes
1answer
58 views

How to integrate a separate sub-network within a customer's existing LAN? [closed]

I work for a machine builder, and our system has it's own ethernet network (192.168.1.x) with a switch and a dozen devices, most of which have firmly established static IP addresses. For our next job ...
-1
votes
2answers
47 views

Configuring several subnets on a single IP [closed]

Is it possible (and correct) to configure one single IP with several subnets? For example: ip subnet 172.30.176.17 172.30.176.0/23 172.30.176.17 172.30.176.0/24 Is this a valid ...
0
votes
1answer
51 views

Class C Addressing [duplicate]

I recently saw someone use '200.1.2.0/18.' This doesn't make any sense to me. This is a Class C address with a subnet mask of /18. I thought the subnet mask for a Class C had to be at least /24. How ...
1
vote
1answer
80 views

Client doesn't get new IP when switching between subnets/locations

So here is our setup. We have 14 locations each with its own subnet and router. The routers at these locations have DHCP relay enabled that points back to our central server that is running DHCP. ...
1
vote
0answers
36 views

Correct name for the two reserved addresses in every subnet? [duplicate]

In the subnet 192.168.0.0/24, the IP addresses 192.168.0.0 and 192.168.0.255 are both unusable in the traditional sense, but all addresses in between are usable as expected. I understand that ...
2
votes
3answers
150 views

how to configure two ip blocks for use on a network

My ISP has given me a /30 and a /27 ip block I can use. for the sake of not giving out my ips I'll use 192.168.1.192/30 and 192.169.1.224/27. I'm not using a router in my setup, I only have a switch. ...
0
votes
1answer
135 views

How to configure network with two routers?

Is it possible to have two routers in the public accessible subnet? ->forward all traffic for [177.x.x.{3,5,7}] Internet --- [177.x.x.1] ...
0
votes
1answer
49 views

Can a router connect an IP network on one interface, and use one of the network's IP on the interface to the internet?

This is part of a question from a networking class. A router has IP 202.55.0.5 on the local network 202.55.0.0/21(through eth0), and uses IP address 202.55.0.6 to communicate with the internet ...
0
votes
1answer
74 views

How to define my entire network with address range or subnet mask

I need to define my entrie network to the trusted zone. I woud like to ask, how to do this: If i have many network like: 10.30.1.1 - 10.30.1.254 10.30.2.1 - 10.30.2.254 10.30.3.1 - 10.30.3.254 ...
0
votes
2answers
718 views

Cisco router configuration subnet

I am configuring a router to three different subnet as follow. Sub1: 192.168.1.1-254 255.255.248.0 Sub2: 192.168.2.1-254 255.255.248.0 Sub3: 192.168.3.1-254 255.255.248.0 In my ...
-1
votes
1answer
89 views

a special case about subnet mask calculation [duplicate]

I have an IP addresses 192.168.2.0 and a subnet 192.168.1.0/10 And I have two questions. (1) Is 192.168.1.0/10 legal? As the 9th least significant bit is not 0. And if (1) is true, does 192.168.2.0 ...
0
votes
1answer
61 views

Small remote network fileserver access [closed]

I need to connect 4 separate offices to the same file server remotely. To achieve this the offices will be connected over the internet with BT ADSL using LAN to LAN VPN routers with the following IP ...
3
votes
3answers
207 views

What's the formal definition of the magic number of a network? [closed]

I know what the magic number of a network is. I know how to compute it - 2 ^ ((32 - n) % 8). I know what it's used for and how to use it. I don't how how to define it formally. In a recent interview ...
1
vote
1answer
967 views

Best way to calculate optimal subnet masks for a range of IP addresses? [closed]

I thought I saw a tool like this once upon a time, but can't find it anymore... Anyone know a tool that would take a free range of IP addresses (as in start / end) and calculate a set of submasks ...
1
vote
3answers
116 views

IP Address Subnet [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? We currently have a: 192.168.3.0/24 Subnet. We are looking to make this subnet larger as we need about 500 IP addresses in the above ...
-1
votes
1answer
129 views

need to figure out this subnet mask please is it correct? [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? The largest subnet has 300 hosts so I am trying to workout the number of host_id bits I require for the mask but I am confused as each ...
0
votes
1answer
65 views

Routing table connected entries different than interface assigned IP address

I have a HP ProCurve A7102DL router which has eth1 and eth2 interfaces. I currently have eth1 set as my WAN and eth2 as my LAN side. My eth2 has three IP address assigned to it which are A.A.A.1, ...
1
vote
1answer
55 views

Can I use the CLI to reset an IP address from a different subnet?

I'm working with a small office network which has fifteen devices on 192.168.2.x. They want to add a print server to the network. Simple enough, except that the print server seems to think it's ...
4
votes
2answers
165 views

Is this IPv4 and subnet combination public or private? [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? I thought I understood this but I am momentarily confused. Here is an example: Are all IPv4 addresses from 192.168.0.0 to 192.168.255.255 ...
1
vote
1answer
542 views

dhcp same subnet different vlans

I want to setup my work's network so that all wireless clients get assigned a certain IP range but are on the same subnet as the other network devices. Currently I'm running dnsmasq for DHCP and DNS ...
1
vote
0answers
56 views

Server 2003 R2 - II6- granting access to website via IP with subnet range

We are trying to allow for a client to connect to our website. By default we are Denying all access except for those with the specified IPs we have configured to run, everything before has just been a ...
4
votes
5answers
537 views

Share one IP address with a simple router

We have just moved into a new office and have been given our 'internet connection' in the following form: One Ethernet cable in the corner of the room An IP address with subnet mask 255.255.255.0 ...
0
votes
2answers
108 views

Is auto-detection of routers on the local network possible?

Suppose one has configured a bog standard Ethernet connection - there is an IPv4 address, a subnet specification, a default route, even nameservers in resolv.conf, static routes everywhere - is it ...
1
vote
1answer
613 views

How to add IPs to a CentOS Server?

I wanted to know how to add the Prefix, the usable range & the subnet mask. I'm a completely new to this field so I would need step-by-step instructions. Thanks in advance. Regards, Netizen P.S. ...
6
votes
1answer
844 views

If I change a router's subnet mask to one that includes the old one, will the hosts with the old configuration still work?

Currently I have a router that is addressed as 10.2.1.1 on a 10.2.1.0/24 network. All of my hosts have default gateway 10.2.1.1 with mask 255.255.255.0. I want to know: if I change my router to ...
5
votes
3answers
2k views

Changing netmask from /24 to /16 on a Windows 2003 domain

I have a Windows 2003 domain using 192.168.0.0/24 with all static addresses (no dhcp). I want to move to 192.168.0.0/16 because we need more addresses. I understand that we need to change netmask ...
0
votes
2answers
173 views

What is the best IP/Subnet set up strategy for a multi-server webhosting setup?

Sorry for the mixed-up title, but let me try to explain better: We run a hosting solution, which until now has supported shared hosting and VPSes. Easy enough. We are now getting larger clients ...
0
votes
1answer
261 views

How many assignable addresses are needed for a router-to-router connection?

I have an address zone (let's say 150.41.0.0/16) and I want to subnet it optimally using VLSM. I have a number of VLANs, each with a minimum number of needed addresses, and a couple of ...
0
votes
2answers
215 views

Where do I learn about IP blocks and subnets? Or is there just a calculator that does it all for me? [duplicate]

Possible Duplicate: How does Subnetting Work? Amazon's elastic compute tool (among others) requires the ip block format for their command: ec2-authorize websrv -P tcp -p 80 -s ...
2
votes
3answers
2k views

Are same IP address with different submask unique? [duplicate]

Possible Duplicate: How does Subnetting Work? In a same block of IPv4 addresses, can there be same IPs with different submasks? For example, can I have this: 180.70.65.140/26 ...
1
vote
3answers
431 views

5 IP Addresses on a multi-homed NIC, 4 ping-able, what's wrong with the 5th?

Dell Server, broadcom NIC, 5 IP addresses all on the same subnet. Let's say 100.100.63.67-71. Windows Server 2003. From another system on the 100.100.63.* subnet, I can ping all IP addresses no ...
0
votes
3answers
5k views

Finding the first and last address of a block of IP addresses with subnet mask

I am not sure if this is the right place to make this question but I thought this is one of the most appropriate SE's site to make a question on networking. Please move it to other more appropriate ...
0
votes
1answer
252 views

How to change my domain from 192.168.1.0/24 to 192.168.21.0/24

We are about to start using hosting service for the software we use and they've asked us to change it. I'm sure I can figure out how to change the DHCP scope, but that's not what I'm worried about. ...
2
votes
6answers
5k views

Find device with static IP on different subnet

I bought an used Lantronix Spider and I cant seem to see it on my network (from my routers dhcp table). So my idea is that the device is not configured to use DHCP and assigned a static IP instead ... ...
1
vote
2answers
154 views

How to find the subnet for a single IP?

I have always used the subnet tools on the web when our datacenters provide us with new ip blocks for our machines. However, I recently ordered more IPs from our European DC and they apparently just ...
9
votes
3answers
722 views

Creative IP/subnet/dns schemes

I've only administered rather small networks (<=25 nodes). Usually I put the gateway .1, dns/proxy as .10, mail at .20, printers at .30-39 and so on and so forth. I never directly use IP addresses ...
2
votes
2answers
832 views

Hazards of increasing network size by changing the netmask

We are running a small network with address range 192.168.0.0/24. So we only have 254 IPs available. We want to increase this range slightly, to allow more hosts in the network. So if I change the ...
3
votes
5answers
1k views

Basic IP address structure

We currently have a few servers, around 30-40 workstations and 16 phones. Each device has a static IP address. As an example the standard settings for a new workstation is; IP: 192.168.1.XXX ...
4
votes
2answers
268 views

Subnet Mask problem

I'm studying for a test and found myself in a "dead end" with a question about netmasks. The question is: Based on the next figure, once both sub-nets are configured, it's observed that hosts in a ...
1
vote
1answer
409 views

How to route VoIP phone through VPN

We have two offices (China and US) connected by site-to-site VPN using 2 Linksys RV082's. We also have a VoIP system with 2 VoIP phones in the China office. We have been having trouble with the ...
2
votes
1answer
504 views

Static routes for making hosts on different network accessible

I have a ubuntu router machine with following network settings: br0 192.168.1.15 netmask 255.255.255.0 br0:1 192.168.2.209 netmask 255.255.255.248 I have a pc attached to the br0:1 network with ...
2
votes
4answers
474 views

2 servers cannot see each other in internal subnet (192.168.1.10)

I have a few servers in one rack. They all have 2 network interfaces eth0 and eth1. On all, eth0 has a public IP address assigned which works well. I'm setting up a private subnet on the second eth1 ...
0
votes
1answer
101 views

Subnetting/VLSM Help

i'm having trouble creating a IP Adressing Scheme, I have been given 15 sites each of these are connection via MPLS or leased line. For the first site I have determined I need 1700 nodes my tutor ...
0
votes
3answers
325 views

Cannot connect to computers on same subnet

Newbie question. I have a motorola surfboard router and two computers running windows 7 64bit Pro. Both can connect to the internet fine, but they cannot see each other. I need to remote desktop from ...