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Questions tagged [cidr]

68 questions
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1 answer

Does 0.0.0.0/7 represent the same range as 1.0.0.0/8?

The range of 0.0.0.0/7 is 0.0.0.0 - 1.255.255.255. The range of 1.0.0.0/8 is 1.0.0.0 - 1.255.255.255. AFAIK, 0.0.0.0/8 (0.0.0.0 - 0.255.255.255) is not usable. So, do these represent the same range practically? ip route add 0.0.0.0/7 dev eth1 # 1 ip…
Szymon Marczak
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7 answers

What does the netmask in an IP address actually tell you?

There are several questions out there asking what the CIDR netmask is, and how it's calculated. But after reading all the top answers, I'm still left wondering, how does the netmask let us distinguish two IP addresses? For example, if I give you…
CodyBugstein
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1 answer

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 I have figured out the answer but I would…
Peter davies
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1 answer

How To Add Multiple /24 Network IPs in Ubuntu

We have a client who needs to set up 2 Class C (/24) address ranges in Ubuntu. We have a single nic connected to the switch currently and the IPs are set up at the switch. We have done this many times in RedHat based systems by using the…
Dave Drager
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3 answers

13 IP addresses, how to add them to domain SPF?

Let say I have these IP addresses on my server: 170.120.210.209 gateway 170.120.210.210 server…
Willy
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4 answers

AWS VPN Client connection to new VPC Endpoint is failing

I have set up a new VPN following the guide here. However when I try to connect to the VPN with the client i get an error "Connection failed. Try again." This happens every time. I opened the log file from my AppData\Roaming\AWSVPNClient\logs folder…
Salbrox
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Is it possible to change CIDR network flannel and Kubernetes

Is it possible to change CIDR network flannel on running Kubernetes cluster? If yes what will happen with the launched pods? Thanks
Kris454
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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. I'm trying to make this change on the Cisco…
Dustin Dauncey
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How do I divide a network into smaller subnets using a single Layer 3 switch?

I have had trouble searching for help on this one, as most searches for VLSM, CIDR and layer 3 switching bring back very basic questions posted by students just starting their CCNA. I have a batch of public IPs that have been assigned to me. These…
sram
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Can't authorize a server for Amazon RDS

We are attempting to slowly migrate a website over to AWS among other things. We decided the first thing to move was the database. We have some dedicated server with a different hosting provider. We only have one IP. I am having trouble authorizing…
Parris
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2 answers

How to determine largest cidr in a range of IPs

Say I've got a begin ip and an end ip. What would be the easiest way to figure out the largest cidr I could allocate from this range in order to reduce fragmentation? For example, I have the range 10.10.1.0 - 10.10.2.128. I request a /25. The…
ftdysa
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Adding exception to nginx HTTP basic authentication based on being on the local network

I'm running an installation of a webapp running on a self-hosted server which is on my main network along with all our company PCs and a couple of other servers. We've decided we want to add HTTP basic authentication as an extra layer of security,…
shaneoh
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1 answer

How can destination addresses 132.148.77.28 and 132.148.77.28/32 be use different network interfaces for routing?

The output of netstat -rn on my FreeBSD virtual machine shows that: Internet: Destination Gateway Flags Netif Expire default 10.195.51.254 UGS vtnet0 10.195.48.0/22 link#1 U …
papiro
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How to reserve first 32 hosts in IP address range

I am using NoDogSplash which is a captive portal, meaning it redirects your packets and forces you to authenticate before you can access the Internet. It does this in an isolated 10.0.0.0 network. Now, I would like to make it so that the first X…
derringer
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smaller CIDR network on larger Class C network

I have a network: 192.168.31.0/24 and computers on the network have static IPs 192.168.31.* I'd like to segregate 5 of those computers (say 192.168.31.201 - 192.168.31.205) and put them behind a router/firewall (ClearOS) with firewall rules to only…
steven_esteban
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