A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets. Subnetting provides a way to use the number of IPv4 addresses in an ...
4
votes
4answers
114 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
...
1
vote
0answers
41 views
Setting up a VM to use a different IP range than vSphere/ESXI host
I currently have a server that is running vSphere 5 (ESXi). My management interface (VMKernel) has an address of 173.198.215.78 and the gateway on that one is 173.198.215.78. It appears to be set up ...
4
votes
1answer
69 views
In what scenarios would a VLAN not align 1:1 with a subnet?
Under what scenarios would a VLAN not align with a subnet. I've been told that genearlly they always go 1 to 1. What are some examples or scenarios, and reasons for anything besides that, and for what ...
2
votes
1answer
48 views
WDS and multiple subnets subnets
Goal: To allow my one WDS server on Subnet A to accept client PXE boots from subnets B, C, D, and E.
Setup: Currently, WDS is installed and configured with default settings on my Deployment (Server ...
1
vote
2answers
49 views
Subnetting advice
so I have a quick question regarding sub netting. I have asked my lecturer but I am not sure he understood what I meant..(don't ask)
So we were going through an example, creating two sub-nets on one ...
1
vote
2answers
94 views
Connecting two subnets using an Ubuntu 10.04 LTS as a router
This has been bothering me for a couple of days,
I have two subnets:
192.168.1.0/24 : This is the subnet used by my ISP/router. The gateway to the WAN is 192.168.1.1
192.168.2.0/24 : This is a ...
1
vote
0answers
46 views
Calculating the round trip time for ping packets
I am currently practicing for my network & communications course and have managed to confuse myself slightly on a question about packet round trip time. I have made a start but am now a bit stuck!
...
0
votes
1answer
52 views
Subnetting advice [closed]
I am trying some simple subnetting via Cisco Pacjet Tracer, this was all working fine below but now its causing problems, can someone just verify that this scheme below is fine.
Router 1
S2/0 ...
1
vote
0answers
62 views
Multiple subnets on a single interface in EC2
I'm currently working on setting up a QA environment on EC2 along side our production environment. All of the instances are within a VPC setup, with the following subnets:
10.0.83.0/24 - Production
...
-1
votes
1answer
49 views
VLSM network subnetting and expanding of ip range
I have a subnet/vlan which is almost full I want to expand it basically my layout currently is below:
VLAN ID Useable IP Range Network Mask
10 192.168.1.1 to 192.168.1.14 ...
0
votes
0answers
38 views
How to route into subnet using software routing
I have a VMWare "bubble" that has freesco installed as the "router" between the outside of the bubble to the inside. It has port forwarding setup to allow direct connection to the servers inside for ...
1
vote
3answers
141 views
multiple subnets on the same cisco switch port
We have several servers on colocation and now trying to re-organize the network by utilizing Cisco ASA 5505 as a router and Cisco 3750x series switch.
Network topology is looking like that:
...
0
votes
3answers
84 views
How to reach a device on a different subnet?
I have what may seem to be a basic question about routing, but I ask it because I am not sure where to start.
I have a simple network setup:
Client1, Win7, 192.168.0.50, default gateway is set as ...
0
votes
1answer
38 views
Block IPs in Local Security Policy
What would be the most efficient way of blocking a list of IPs in Windows 2008's Local Security Policy?
Ideally, I would want to block the subnet that the IPs belong to. What IP subnets should I be ...
0
votes
2answers
64 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 ...
0
votes
1answer
147 views
Public subnet configuration on a Cisco ASA 5520
I'm trying to set up a Cisco ASA 5520 as the main entry point for our datacenter setup.
This setup includes:
Three private networks (management, SAN and backup) that are used in a cloud server ...
0
votes
2answers
84 views
While using Nmap and sweep the network with a ping
I'm studying up on using Nmap, and there is a command that sweeps the network with a simple Ping scan to determine which hosts are online.
The command is this:
1 [ignore_this]# nmap -sP 10.0.0.0/24
...
3
votes
1answer
127 views
Subnetting into 6 CIDR/24 network and 2 CIDR/27 networks?
I am revising some questions for an exam and one of the questions was provide the ip numbers and a diagram for a company which has 3 branches. Paris/Berlin/Cairo (random locations I know) Now I belive ...
-1
votes
1answer
72 views
how to communicate in typical router switch router scenario?
I'm learning routing using packet tracer simulation and I think this is a very commun scenario:
let's say pc4 is the server...
why I can't ping from PC1 to 192.168.2.253 (router1) but I can ping ...
0
votes
1answer
27 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 ...
1
vote
1answer
48 views
Adding Static IP's to the NIC
We are currently working on migrating a lot of new machines to our network, and my job this morning was to setup all of the IP Addresses. I worked on this all morning, and when I got back tonight I ...
0
votes
1answer
50 views
PTR Record for host in VLSM subnet
I understand that this is the way a PTR record would be made on a Class A subnet (10.100.250.100 255.0.0.0)
dnscmd /RecordAdd 10.in-addr.arpa. 100.250.100 PTR host.domain.tld
To clarify the syntax, ...
2
votes
1answer
72 views
Howto maximize utilization of assigned subnet block for DMZ
I'm part time sysadmin for a small hosting company with currently 20 different public servers. We have a 27 subnet block that gives us a maximum of 30 usable IP addresses. That much I know, but how do ...
2
votes
0answers
95 views
Connectivity issues with dual NIC machine in EC2
I'm trying to get some servers set up in EC2 in a Virtual Private Cloud. To do this, I have two subnets:
10.0.42.0/24 - Public subnet
10.0.83.0/24 - Private subnet
To bridge these two, I have a ...
0
votes
1answer
47 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. ...
0
votes
0answers
104 views
Multiple IP Blocks in pfSense
How can I implement CARP shared IP and WAN access for multiple public IP blocks in a CARP-enabled pfSense cluster? For example, say I have 11.11.11.129/27 and 11.11.12.129/27, which of the following ...
3
votes
2answers
157 views
How ISPs will assign IPs /subnets for end users in IPv6
Consider two scenarios:
The end user has a simple computer, dual-stack
The end user has a LAN behind a dual-stack router
How will ISPs differentiate each one of these kind of users in IPv6?
An ...
0
votes
2answers
56 views
Connecting between subnets
The scene:
There are two subnets
Network A is 192.168.1.0/24 via router 192.168.1.1.
There are two hosts, host A1 on 192.168.1.2 and A2 on 192.168.1.3
Both A1 and A2 have only one NIC, and none ...
2
votes
4answers
196 views
Cisco ASA - Multiple Public Subnets
I have an existing Cisco ASA 5520 configured with a /28 subnet on the outside interface. My hosting provider just provided me with a new non-adjacent /28 subnet which is routed to the outside ...
2
votes
1answer
63 views
Selective Routing Between Subnets
I have a configuration with two subnets. For this example I will call them 192.168.1.128/26 (128) and 192.168.1.64/26 (64). The 64 subnet contains all the internal devices that guests should not be ...
6
votes
1answer
134 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 ...
0
votes
1answer
210 views
Accessing VMWare Management Network from a different subnet
Here's the scenario...
We've got a VSphere ESXi 5 box running on a 9.x subnet, our office runs from the 1.x subnet. We can access the VM's running on the box without issue (which also have 9.x IP's) ...
0
votes
2answers
72 views
No route to host in different subnet
My new employer has two subnets, x.y.74.* (with default gateway x.y.74.33) and x.y.75.* (with default gateway x.y.75.1).
The .75.* subnet is reserved for servers, i.e. machines that offer services to ...
1
vote
1answer
116 views
How to add subnets to Windows Firewall “local subnets”?
On Windows Firewall under an individual rule the scope tab allows you to define which ips are subject to the rule. One of the built in options is "Local subnet".
How can you add an additional subnet ...
0
votes
1answer
94 views
In 2 tier firewall, how to configure so that only the 1st tier is doing the NAT
We recently done a network intra upgrade by adding an additional firewall as the 1st tier firewall, and making the current one 2nd tier. The setup is:
WAN <--> 1st Tier Firewall <--> ...
4
votes
3answers
205 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 ...
7
votes
6answers
733 views
Running out of IP addresses
We are running out of IP addresses on our expanding network. The current range is 192.168.1.0/24.
Considerations:
We use an ISA server as a proxy for all web traffic, this is our current default ...
0
votes
2answers
77 views
Default Route Configuration by IP Range
I have a scenario where I need responses on a certain range of addresses to go out through one default route and another to go out through another but don't know how to setup the route add commands to ...
-2
votes
3answers
222 views
Packets dropped due to NAT? Firewall? Unroutable private IP addresses?
Preliminary note
This question is out of academic interest. I know how to work around the limitation. I use this setup to control access from one subnet to the other on IP level which works great so I ...
2
votes
1answer
212 views
tcpdump filter on network and subnet mask
I'm using the following tcpdump command:
tcpdump -w net75.out -s 0 host 65.207.95.222
I want to change the filter on the single host to be all addresses in the following subnet:
65.192.0.0/10
I ...
0
votes
1answer
80 views
Overcoming same private IP addresses, different subnets
I am preparing for migration to VMWare ESXi. Part of this involves P2V a large number of physical servers. Since a lot of our applications depend on the IP addresses to stay the same (i.e. they ...
3
votes
4answers
356 views
OpenVPN performance terrible to other machines on server's subnet [closed]
I'm using a "server" that is a hacked-up first generation Apple TV running Linux.
I'm having a lot of trouble getting OpenVPN performance to be what I would expect with my new OpenVPN setup. The ...
3
votes
3answers
147 views
Building up a network structure
I have the following structure:
So in this case I have two different networks. What device can handle this structure, also PoE WiFi. In this case I have two measurement system attached in the PC B ...
0
votes
2answers
155 views
Restrict access to website in IIS to a range of IP addresses
I'm configuring a website in IIS6 to restrict access to a customer's IP address range.
I've been given their IP address (81.145.41.114) and an IP range (172.17) which I am meant to allow access to.
I ...
3
votes
1answer
141 views
Subnet Masking in IPv6
I know within IPv4 subnet masking, the network is determined by either the 1st, 2nd or 3rd set of octets. Being there are so many more characters in IPv6, how do you determine the subnet mask?
2
votes
1answer
110 views
setting up 2 subnets, Windows Clients (30 nodes), Linux Server, Samba, FOG
Its my first post on serverfault and my first time to setup this kind of network, so my apologies in advance if it is not well formed.
I'm planning a small (education center) network that has about ...
2
votes
2answers
176 views
One big subnet with all clients an issue?
Disclaimer: Network rookie, might have wrong assumptions.
Got a basic subnet question that im interested in hearing your thoughts about.
Subnet: 192.168.251.0/24
Address Range for servers: ...
0
votes
1answer
107 views
VTP Domain on 2 Subnets
Let's say you have 2 different subnets (10.100.0.0/22 and 10.100.8.0/22) in one subnet. You've set up your own VTP domain. If I want to add the 2nd subnet in that same VTP domain, would there be any ...
2
votes
4answers
215 views
Best way of isolating VM's to protect network?
On our network (1.0/24) we have a number of servers. One of those servers is running VMware ESX with three virtual machines which are hosting various websites and applications to the outside world.
...
1
vote
2answers
145 views
/32 subnets on Ethernet via DHCP
Is it possible to assign to an ethernet host via DHCP a subnet mask of only the host itself, e.g. 192.168.1.123/32? Do common operating systems support this kind of configuration?
I'd like for the ...
