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Questions tagged [subnet]

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.

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(pfSense NAT) Cannot reach NAT device on same subnet through WAN address

To preface, I am using pfSense to manage my network. The subnets listed below are separate physical networks on the pfSense. 10.99.99.0/24 is LAN and 10.69.69.0/24 is DMZ. On the pfSense I have pure ...
vaughngx4's user avatar
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Internet Facing load balancer infront of 2 private instances

I am trying to setup 2 web instances in a private network and put an internet facing load balancer infront of my two instances. This is what i want to achieve: The 2 private instance should be able ...
Mervin Hemaraju's user avatar
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Exclude local sub-net (local IP ranges)

In my company's VPN app we have a disable-able feature which excludes below List of non-web-site IP-address ranges from being routed into the VPN server. This allows local-net Apps to continue working ...
Top-Master's user avatar
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1 answer
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PFSense: Subnet can not communicate to the outside

I have multiple subnets on a hypervisor with four Ethernet ports. Two are called subnets. Both of them are utilizing a NordVPN tunnel as their default gateway. The first subnet LAN can talk to ...
daniellooartist's user avatar
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Having 2nd router's LAN be on same subnet as main router (and not just wifi)

Below is a diagram of my network: MAIN router: 192.168.0.1 with DHCP assigning beginning at 192.168.0.5 2nd router: Running openWRT in AP mode. Receives a statically-assigned IP of 192.168.0.2 from ...
darnitdiy's user avatar
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Can two LAN networks both at one level behind a router higher up the routing chain use the same subnet mask and network ID? [duplicate]

Can two LAN networks both at one level behind a router higher up the routing chain use the same subnet mask and network ID? See the diagram below. This question was already answered here, but I am ...
riverofwind's user avatar
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1 answer
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No connectivity in LAN (arp table does not learn IP addresses)

enter image description hereI have a server connected with NICs as follows, 10.0.11.11/24 - no gateway required. 10.0.10.11/24 - with gateway 10.0.10.240 192.168.2.11/24 - no gateway required. When ...
Vidura Thammitage's user avatar
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2 answers
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Ip routing two subnets

I've got two subnets A: 192.168.2.0/24. Within A we have got a firewall and a connection to the internet. B: 172.16.12.0/24. They are connected with each other via a switch and both subnets are ...
Nils's user avatar
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Docker Swarm nodes on different subnets

I'm trying to setup a docker swarm between two computers I have at home and a VPS, the configuration is the following: Manager ip: 192.168.1.132/24 Manager second ip: 192.168.100.1/24 (VPN) ...
gesucritto's user avatar
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1 answer
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Creating a server with fixed IP that can be freely moved among networks

Given a public /24 prefix, announced via BGP, 192.0.2.0/24. I have split this prefix into various smaller networks. I would like to use 1-2 servers for the DNS server (forward and reverse) which needs ...
divB's user avatar
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How to connect wireless clients to different physical subnets via a single access point but ensure traffic between subnets remains segmented

I’m trying to design a network with a pfSense Firewall / Router. In pfsense I have created four subnets that reside on separate physical ports (not VLANS) on the pfSense hardware: The idea will be ...
SneakyShrike's user avatar
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1 answer
133 views

3 Servers, Infiniband, without IB switch

I took a look every post related similar questions but they didn't give me clear answer. Our planned system consists of three machines named n1, n2, and n3. The connection is set up as follows: n1 ----...
ilkyu tony lee's user avatar
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2 answers
166 views

Subnet mask for 192.168.1.7/30

I want to create two IP addresses, 192.168.1.0/30 and 192.168.1.5. Adding the first IP for the router port returns this error "Bad mask /30 for address 192.168.1.7": Router>en Router#conf ...
Mohammed Al Shemmari's user avatar
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1 answer
591 views

Adding more IP Addresses to a Subnet in AWS

I have a Subnet with CIDR 10.0.4.0/28 (15 IP addresses), which is now exhausted; so I want to add more IP addresses. Is it possible to add more IP addresses to the subnet? I see that I can add a ...
Techboy's user avatar
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Can a gateway use the network address, or can the network address be anything other than the first number in that subnet range?

We were sent the following gateway info from our ISP: gateway: XXX.XXX.XXX.8 /29 I am Xing out the first three octets for privacy purposes because they will remain the same in a /29 network, and we ...
Rob Pressler's user avatar
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Windows Server 2019 erroneously changing the subnet on NIC1 to /24 after each reboot, but it should be /22

Every time I reboot this Windows Server 2019 VM, Windows changes the subnet from 255.255.252.0 to 255.255.255.0 which is incorrect. The subnet must be /22 (255.255.252.0) for traffic to pass. I found ...
SamAndrew81's user avatar
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1 answer
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OpenVPN - Server cannot access devices in client's LAN

I have an OpenVPN server (10.1.0.0, 255.255.255.0 VPN subnet) and a client with a local subnet of 192.168.1.0 255.255.255.0. Server VPN IP is: 10.1.0.1 Client VPN IP is: 10.1.0.2 Server local IP: 172....
Hanz94's user avatar
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How to add delegation to existing subnet in azure bicep?

I am trying to create azure app function which should be accessible to postgres in private vnet. But, it seems the network is showing error as already delegated so can't add that. So I tried adding ...
sardar's user avatar
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IP ending in all zeros: valid (for /128) or possibly confusable with anycast?

Host Europe assigned a VM I just rented from them an IP address ending in all zeros (2xxx:xxxx:xxxx:xxxx::/128). I claimed this as possible interop problems as addresses with the last 64 bits all ...
mirabilos's user avatar
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squid: Unable to allow 10.10.11.0/24 but 10.10.11.0/23 works

Im unable to make a working acl with CIDR over `/23` (squid 5.7 on Debian) For example i got this config (working): acl servers src 10.10.11.0/23 http_access allow servers ... http_access deny all ...
mylan's user avatar
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Access subnet from another subnet

I have ipv4 address 192.168.88.130 assigned by DHCP (cannot use static IP). I have to access devices on 192.168.20.X by changing adapter settings to static and assigning some IP from 192.168.20.X, and ...
gmijo47's user avatar
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1 answer
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Windows Server with two NICs with cross communication between the two with DMZ

Network Topology I have a Windows Server that is connected to a modem with a public ip address of 42.251.46.174 which is in DMZ that we will call Modem1. I then have a modem with the public ip address ...
Stephanie Schneider's user avatar
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2 answers
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IPTables: introduce a policy for a chain so that I can maintain the drop policy/rule without having to delete it when I need to add a new accept rule?

Say I have a chain introduced with iptables -N SERVICES-VPN. But then I want this chain to drop everything... so iptables -A SERVICES-VPN -j DROP. The problem here is that I may need to add rules ...
The Quantum Physicist's user avatar
1 vote
1 answer
564 views

Routing traffic between A and C using A-B wireguard's network

I'm having some difficulties setting up a routing between 3 nodes. Here's the situation: A, B and R are wireguard (wg0) peers R is a public hub (vpn.example.com) with IP 172.0.0.1 A is a peer ...
ARDVL's user avatar
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1 answer
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What subnet mask to use for a virtual IP in pfSense

I have a subnet 192.168.0.0/24. I want to create a new virtual IP address (VIP) in pfSense at 192.168.0.2. What difference does it make what subnet mask I use for the VIP? Should I set the VIP to 192....
lindhe's user avatar
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Properly configuring iptables rules behind an openvpn server

hi friends hope everyone is doing well. i got a little misunderstanding of how i should configure iptables v4 rules for an openvpn server. if some wizard can give me a hint it would be great. i'm ...
infoman33's user avatar
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2 answers
490 views

Getting IP address from another subnet's DHCP

As in the diagram below I have two routers on two different subnets. I connected them together but have not set static routes yet. Network Diagram However, when connecting from Access Point A's SSID, ...
Reedz's user avatar
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1 answer
184 views

Connecting to OpenVPN blocks access to local VLANs on different subnets

When I'm connecting to an OpenVPN provider, such as NordVPN, I lose connectivity to my local devices which are configured on another subnets. Eg. the computer connecting to NordVpn is on vlan A which ...
M.Parent's user avatar
-1 votes
1 answer
38 views

Internet reachable from the first subnet, not from the second, on same NIC

Hi (I hope this a the right place) I'm working on ubuntu 18.04 with ifupdown (/etc/network/interfaces etc.), not netplan. I'm trying for several days on this difficulty. one PC (A) with 2 cards : ...
romaillard's user avatar
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1 answer
263 views

IPv6 - Are the last 16 bits of the network ID always reserved for subnetting?

I was reading about IPv6 address structure and it has two portions one for the network (Network portion/Network ID) and another for host (Interface ID/Node Part) something like IPv4 has regardless of ...
sam's user avatar
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0 answers
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nordvpn whitelisting 2 subnet LAN hierarchy

I have a network setup like this: Ubuntu Laptop (192.168.1.157) --> Router B (192.168.1.1) --> Router A (192.168.0.1) --> Internet and CIFS NAS drive (192.168.0.50) --> Router A (192.168.0....
Tyn's user avatar
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1 answer
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Hiding subnet from router

Lets say I have a network layout similar to this: What do I need in the ? node so that all of the PC's are not discoverable form the main network, but can access the main network/internet? I don't ...
Primemaster's user avatar
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0 answers
199 views

AWS: Ping between multiple namespaces in seperated EC2 Instance

I am encountering an issue where I am unable to receive a response when attempting to ping from a namespace located within a public EC2 instance to a private one. To better illustrate my situation, I ...
Tanvir Rahman's user avatar
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1 answer
1k views

AWS VPC Subnetting

I have a VPC created with a CIDR block of 10.10.0.0/16. I am trying to subnet that block into some /24's -- ie. 10.10.1.0/24 It wont let me. The error I get is: CIDR Address overlaps with existing ...
mikem's user avatar
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4 votes
1 answer
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What does the subnet mask of the tunnel ip in Wireguard do?

Wireguard works even without setting a tunnel IP address, i.e. it's enough to set the AllowedIPs, endpoint addresses, private and public keys. In the docs of OpnSense, there is the following warning: ...
Georg Schölly's user avatar
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1 answer
1k views

How is NAT Port Exhaustion handled?

"Port address translation (PAT) resolves conflicts that arise when multiple hosts happen to use the same source port number to establish different external connections at the same time. PAT may ...
Anup Buchke's user avatar
-1 votes
1 answer
466 views

computer get dhcp from windows server dhcp server that is in other subnet

i have server with windows server 2019 with dhcp server role installed i'v created this scope: 192.168.9.1 - 192.168.9.10 with subnet 255.255.0.0 also i'v created a virtual lan card with this ip: 192....
mikuzan's user avatar
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-1 votes
1 answer
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List all active devices in different subnets?

My company has a class A network that contains various subnets. I need to automate a way to produce a list of all online devices (in all the subnets). To start, just a list of responsive private IPs ...
Andrew Campi's user avatar
1 vote
3 answers
891 views

Internet access problems on subnet

Hello Server Fault friends! I have a question that I believe should be easy to answer for someone who really gets how a typical subnet should be configured with a router such as PFSense. My Problem: I ...
Martin Surasky's user avatar
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1 answer
121 views

How to configure a /27 subnet on vlan Centos 7

I have a dedicated server running Centos 7. I purchased a /27 subnet from my hosting provider. They said: "Your /27 subnet should be acceptable over vlan-interface with tag 18." I asked them ...
IndyDevGuy's user avatar
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1 answer
821 views

How to forward traffic from one LAN router through another router then to the original gateway?

I have two routers connected to my ISP within one town in the subnet 192.168.0.0/24.Router A can reach router B successfully. I have higher bandwidth on router A than B. I would like to make A the ...
frequency ent's user avatar
0 votes
1 answer
222 views

Can not get Virtualizor IP pool working with /27 subnet

I've been scratching my head a few days at this now and I am by no means a networking expert but I know (most) of the basics. I've got Virtualizor setup on CentOS 7 and I'm trying to add a new /27 (...
IndyDevGuy's user avatar
1 vote
1 answer
73 views

Accessing Devices on SubnetA from SubnetB

Hi All been beating my head all day and will continue to do so but hoping someone can guide me in a direction. I am currently trying to plug an IP Cam directly into ubuntu machine that has an eth0 ...
Llewyn S's user avatar
1 vote
0 answers
124 views

Can't SSH to ec2 instance on shared subnet

I have a single VPC with one internet gateway and some subnets that are shared across multiple AWS Organization accounts using RAM. The VPC is protected with a Security Group that is managed by ...
somboo's user avatar
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0 votes
2 answers
242 views

Is This the Correct Way to Setup AWS Private Subnet -> NAT -> Internet

We want our internal private EC2 instances to have access to the internet so they can download software and install security patches. Of course, out of the box, your private subnet servers will not ...
YoungDinosaur's user avatar
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1 answer
853 views

Allow communication between two networks through two routers

I have the following setup I would like Device A to be able to communicate with device B and vice versa. I have setup static routing on Router A, and Router B as follows: Router A: 192.168.1.0/24 ...
Kalcifer's user avatar
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0 answers
506 views

Does DDNS work within an ISP subnet?

I'm trying to host a web server through a Raspberry PI 4, but found some problems in the final steps of my configuration. What I did is the following: Install Nginx. Install Node to host my site (I'm ...
Ramon Orraca's user avatar
-2 votes
2 answers
87 views

Can this two IP see each other?

I can't remember how networking worked. I need someone to help me with this, it may sound a bit stupid but I have to take care. This are the two IPs: 107.1.233.7/24 10.202.104.148/25 Simple question....
GBT55's user avatar
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-1 votes
1 answer
218 views

Configure new routing and run DHCP server in router to access internet

SO I am a beginner network professional , I was sent to do a routing in client location so they can access the internet .The routing was supposed to be done on cisco 3900 series router. the following ...
biplab 's user avatar
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1 answer
508 views

Creating Subnet IP address : IPv4 block sizes must be between a /16 netmask and /28 netmask

I'm new to AWS and I'm looking to create a subnet. Whenever I try the defaults subnets under I get either the error message "IPv4 block sizes must be between a /16 netmask and /28 netmask." ...
Christian Fuh's user avatar

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