-4
votes
1answer
44 views

AWS - What do we mean by associating a subnet with an elastic network interface? [closed]

I'm trying to understand the meaning of this output: [user@ip-10-1-3-12 ~]$ ip route default via 10.1.3.1 dev eth0 default via 10.1.0.1 dev eth2 metric 10002 10.1.0.0/16 dev eth2 proto kernel ...
0
votes
0answers
26 views

network inbound from other subnets refused to server A, Server A can go outbound to internal networks, but not internet

I have a RHEL 6 server with 4 NICs on 192.168.2.[30-33]/24 Set with DHCP reservations via infoblox, I have checked and the MACs all match up. ifconfig shows /24 for every netmask, and the routing ...
0
votes
1answer
33 views

incorrent subnet/mask combination

For a network interface, I have defined a range of addresses for DHCP. 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 08:00:27:5a:3e:be ...
0
votes
0answers
67 views

Best way to divide network?

I own a small company that recently is outgrowing our current network. Currently we have a 10.216.170.0/24 network and therefore only a limited number of available IP adresses. Now, we have a single ...
0
votes
1answer
100 views

adding a third subnet on the same router

cisco 2800 series (isp cross connect)Eth0/0 192.x.x.x 255.255.255.252, Eth0/1 192.x.x.x 255.255.255.224 ##Eth0/1.1 192.x.x.x 255.255.255.128 <--- want to add this block in!## I've been granted ...
0
votes
1answer
39 views

VLSM subnetting (CCNA 4) [duplicate]

I do not understand the answer to this question: I thought it was like this: /24 = 126 hosts /23 = 254 hosts /22 = 510 hosts /21 = 1022 hosts Branch 4 has 850 hosts, am I missing something?? Thanks ...
0
votes
0answers
46 views

OpenVPN identical subnets for client & server

I have an OpenVPN server (Ubuntu 14.04 routed mode) on a local network with a subnet of 192.168.0.0/24. The subnet it uses is obviously a very common subnet. My problem When a client is out and ...
0
votes
3answers
528 views

Routing between two subnets using a Linux box with two NICs

I have a Linux box with two NICs, each connected to a different LAN: Network A: 192.168.1.0 255.255.255.0 Network B: 192.168.2.0 255.255.255.0 The routers are: 192.168.1.1 192.168.2.1 Linux NICs are ...
-1
votes
1answer
90 views

Some computers in my subnet do not recognize names of other pc's

I have two subnets: 192.168.0.1-255 192.168.50.1-255 Ewerything works via VPN (because physically computer from both subnets are in different locations). We also have active directory. Now, the ...
0
votes
3answers
89 views

Can I create VLANs when there are subnets already?

I need to have separate subnets in each room but at the same time, I need a few computers (spread across rooms in different subnets) to be in a single VLAN. Is it possible or do I need to rework the ...
0
votes
1answer
61 views

Set up Wheezy Subnets

I'm trying to create multiple subnets on a Wheezy server, where I can run multiple virtual machines off of each subnet. Initially, I'd like to create 2 and I've gotten one of the subnets working, but ...
0
votes
1answer
80 views

What are the disadvantages of re-using the same IP scope in multiple subnets? [closed]

We're designing a somewhat large system that we're not really qualified to design. It will be something like a campus: one main, large network, with about 20 sub-networks that are like departments ...
1
vote
2answers
174 views

Routing Internet traffic through computer on another subnet

Ubuntu box server has 2 network interfaces: eth0 50.57.71.100 eth1 10.182.161.100 Ubuntu box client has 1 network interface: eth0 10.177.30.100 server and client can already talk to each other ...
0
votes
2answers
91 views

Questions regarding my network plan

I'm developing an IT infrastructure room for testing purposes. The overall aim is to create a network, which if fully disconnected from the productive environment and several people can come and ...
0
votes
1answer
273 views

How to get 192.168.3.2 to successfully ping 192.168.2.3

With the layout described below, the following is true: either router can ping any host on either subnet 192.168.2.0/25 hosts can ping (and ssh to) 192.168.3.0/24 hosts but 192.168.3.0/24 hosts ...
0
votes
0answers
21 views

Given an IP and a bunch of IP ranges, how can I tell which range covers the IP? [duplicate]

Suppose I looked up the IP ranges of each Azure data center, and that I had a particular IP address in hand. How would I figure out which range that address belongs to? For instance, I have the IP ...
3
votes
3answers
197 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 ...
0
votes
1answer
53 views

Can I use a subnet to limit access to resources?

I have a somewhat limited knowledge of network configuration, but would like to achieve something like the following: have two work areas set up the "admin" work area happens to be physically ...
0
votes
1answer
141 views

How to add another router on an existing subnet? [closed]

What I am trying to do is basically this. I am on a network who's routing table is something like this. Destination Gateway Genmask Flags Metric Ref Use Iface default ...
0
votes
2answers
87 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 ...
0
votes
1answer
261 views

Proxmox 31 + KVM routing + IP subnet + csf

We have proxmox 3.1 server in netzner with routuing network and IP subnet block. We want to implement csf firewall without interfering the traffic of the KVM VMs, what would be the easiest way? We ...
4
votes
1answer
100 views

why would you create two different subnets on the same physical network?

I'm working at a messy location, one of the strange (for me) things is that on the same physical network there are two different subnets. Specifically some computers will have 10.0.0.0/24 and some ...
-1
votes
1answer
87 views

Can 2 IP's in the same network communicate with 2 different netmask

I need to expand a network really quick and don't have time or access to change the netmask of all devices. Can the following communicate? IP 1 - 192.168.10.10 mask 255.255.255.0 IP 2 - ...
2
votes
2answers
153 views

How to access devices with static IPs on different subnet than router?

I have a SonicWall TZ100, firmware SonicOS Enhanced 5.8.1.13, with a static subnet of 10.0.6.0/24 on X0. Ports X2-X4 are port shielded to X0. On ports X3 and X4 I have two devices that were moved from ...
0
votes
1answer
832 views

Configure DHCPD with assigned IP address and gateway on different subnets for KVM [closed]

I have a dedi with an IP range of 123.123.123.1/24, the problem is the gateway address: 111.111.111.254 and it's on completely different subnet. I have already setup a bridge and KVM virtualization. ...
0
votes
1answer
91 views

Sonicwall Routing Subnets

I have a Sonicwall TZ105W that has a Synology NAS (10.0.0.8) on the LAN zone (10.0.2.0/24). The NAS provides a VPN service that is delegated a 10.0.2.0/24 network. How can I set up routing on the ...
2
votes
2answers
346 views

Why do all computers on my network have the same MAC address?

I'm on a LAN provided by an ISP. My computer has its IP address, Subnet Mask, Default Gateway, DNS Servers(using DHCP). I just wanted to see the MAC addresses of all the computers on my LAN. After ...
0
votes
1answer
2k views

Proxmox - single public ip with multiple vms, openvz containers work, kvm's don't have a route

Currently I only have a /30 block (1 usable IP) (I just ordered a /28 for 13 usable publics, waiting) I just installed proxmox, set up a few virtual containers. Port forwarded the necessary ...
0
votes
2answers
46 views

Getting Two Networks to commincate

As a business(Business A) we recently purchased a second business(Business B) and moved them into the same building, with each business having there own separate domains\environments. Im now in the ...
2
votes
3answers
146 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
54 views

Extend subnet with dfl-800

i have 2 locations which are connected with vpn over internet with 2 dfl-800 firewalls. Address config in firewall: Location 1 address 192.168.0.0/24. (no dhcp) Location 2 address 192.168.5.0/24. ...
1
vote
2answers
179 views

IP Address shortage/Subnetting

Facing a problem where we are running out of available network addreses, we are currently on bog standard 192.168.1.x range. Reading about making more ips available and subnets and think i have just ...
0
votes
1answer
126 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 ...
2
votes
2answers
456 views

Why does the Cisco RV180 not let me use a 255.255.254.0 subnet mask with a 192.168.2.1 LAN IP address?

I'm a Sysadmin for a tech company. We have a Cisco RV180 gateway device. We are at our breaking point for IP addresses, so we are changing from a /24 to a /23 subnet to allow for double the devices. ...
0
votes
1answer
68 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 ...
1
vote
1answer
35 views

Fitting a /21 and 8 X /24 networks within a /20

A /20 network can contain 16 /24 networks. Would it be possible to split the first half of the network into a /21 and put the second half into 8 /24 networks? If yes, is this fairly common?
-1
votes
2answers
106 views

Communication between different subnets with different masks [closed]

I was wondering if there is any way to communicate between two networks with different mask. For example: Network 1: 192.168.0.0 / 29 Network 2: 192.168.0.8 / 28 (which takes from the last possible ...
0
votes
1answer
155 views

Using a CIDR range as a Routed Subnet?

I have a /29 subnet assigned by my ISP, with an SonicWALL office router and a Cisco voice router hooked up to a 'net-rail' of sorts with untagged VLAN switch ports connecting my ISP router's output ...
4
votes
1answer
252 views

How does broadcasting work on a server with multiple IPs?

Say you have two dhcp servers, A and B. Server A has two IP addresses, 10.0.0.1 and 10.0.0.2. Server B has one IP address, 10.0.0.3. Server A has two instances of isc-dhcp running, one specifying a ...
-2
votes
1answer
274 views

Why does Windoes not allow the subnet to be the same as the subnet mask? [duplicate]

In Windows, I can configure a network adapter like this: Ip Address: 192.0.0.1 Subnet Mask: 224.0.0.0 but not like this: Ip Address: 192.0.0.1 Subnet Mask: 192.0.0.0 Why? Why can't the ...
1
vote
3answers
2k views

Running two subnets over the same physical LAN

One of our remote offices has given a security contract to a company that came in and set up IP security cameras and a server in our office. They clearly didn't know anything about integration of ...
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 ...
0
votes
3answers
441 views

Wireshark Promiscuous Mode and multiple Subnets

Is it possible to Sniff traffic with Wireshark where the source IP and Destination IP are on different subnets (of the same network) and neither of them are your IP? NIC is Intel 82579LM.
1
vote
1answer
170 views

Configuring a firewall appliance with 2 VLANs - how are the outbound links on the firewall configured?

We just ordered a sonicwall NSA 4500 firewall and I am preparing a network diagram for its arrival. We have 12 servers in a newly setup rack, a 48-port switch, and a Sonicwall NSA 4500 firewall I ...
1
vote
1answer
155 views

Different Logical Subnet on same Physical network cause Linux Connectivity Issues

We have two Linux CentOS hosts, A and B. A = 19x.2xx.6.4 (/24) B = 19x.2xx.7.4 (/24) Both these hosts are on the same physical switch. The reason why they are on different logical networks is ...
1
vote
1answer
92 views

Unable to connect to device across subnet

I have a network printer (Sharp copier) that I am unable to contact from a different subnet . I am on 192.168.100.x. The printer is on 192.168.200.x. I can ping (or remotely connect to) every other ...
0
votes
2answers
72 views

Rgd: Subnetting about 370 hosts on a /24 Network

Rgd: Subnetting about 370 hosts on a /24 Network I am doing subnetting for the following. There is a school, which got level 1 which is main lobby and 5 levels of classrooms ( level 2 to 6 ) I ...
1
vote
1answer
933 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 ...
0
votes
2answers
52 views

Manage subnetting from simple router

I want to setup two different subnets in the same physical network with one router, these are my questions: Let's assume I want the first subnet like 192.168.1.0-254 and the second subnet like ...