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Questions tagged [cidr]

68 questions
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How will a router handle this destination address?

Let's say I have a router with three interfaces. Interface #1 is 10.x.x.x /8 Interface #2 is 142.100.48.x /20 Interface #3 is 142.100.56.8 /21 I'm trying to send a file to [dest]142.100.57.5 from [src]10.0.0.5 When the router receives my first…
Chef Flambe
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Cannot get HTTPD 2.4 to start when using the Require IP command for access control

This was intended to be a comment on a similar question but since Stack is so restrictive about comments I'm reposting it as they want it: : Here's the documentation: http://httpd.apache.org/docs/2.4/en/mod/mod_authz_core.html#require) Here's the…
eco
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Using a AWS VPN for client access to an internal web-application

I'm trying to connect a client's network to our AWS data-centre, to allow access to a (previously publicly available) internal web-application. At the moment we've got the VPN set up with dynamic routing to a new, empty VPC with a CIDR which doesn't…
user705142
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Connecting two AWS VPC Regions of the same CIDR range

Let say I have two VPC's (VPC-A with 10.50.0.0/16 and VPC-B with 10.50.0.0/16) in AWS with same conflicting/overlapping CIDR ranges in my AWS account. I already have the two VPC's fully functional with 100 plus instances running in either of the…
Aadesh
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Can foreman handle nested subnets?

In Foreman 1.8 one can manage subnets through the web-interface at Infrastructure > Subnets. However, when I add a /24 (e.g. 10.10.0.0 with a subnetmask of 255.255.255.0), I cannot add anything less specific below this subnet (e.g. a /28 - 10.10.0.0…
alboe
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Google IP Address Ranges for incoming SMTP

Essentially I'm answering my own question here, but want to provide this info to anyone else who might need it. I need all the valid IP address ranges for Google Apps mail servers. I'm configuring a firewall to only allow incoming SMTP from our…
dmarietta
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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 and the two firewalls. I'd like to use this as a…
Craig Watson
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subnetting a class c on a cisco 3825

I have a class C that I want to better understand before I implement a change. Right now, ip address 192.168.0.1 255.255.255.192 ip address 192.168.0.65 255.255.255.240 secondary So, where is the 192.168.0.64 address in that mix? 192.168.0.63…
Adeodatus
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How to update podCIDR for Kubernetes master node without recreating it

I have installed a Kuberntes system with one node,the node itself worked as both work node and master node,now I met a problem: When the pod num exceed 255,Kubernetes will failed to deplopy it,after checking the node it shows there is no available…
flyingfox
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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 Subnet CIDR: 10.10.0.0/16. My understanding is…
mikem
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What does 0.0.0.0/0 mean?

For example in an 'allow' statement in BIND or in Chrony config files. Does allow 0.0.0.0/0 mean allowing any clients or allowing no clients? My question isn't about the specific programs, but just generally what is the correct interpretation of…
madacoda
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"AWS CIDR is not within the CIDR ranges of VPC", but it is?

many questions on this, but this time doesn't seem as obvious as the others. I'm trying to split a VPC in two subnets. I start with VPC 10.0.0.0/24, 254+1 IPs, from 10.0.0.1 to 10.0.0.255 I create the first subnet with 10.0.0.0/25, which should…
gabriel
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Is it possible to communicate between different CIDRs?

For example, there are two CIDRs in the same VPC on AWS. One of them is public and one is private. They are in the different segment. # Public Subnet CIDR 10.124.42.0/27 # Private Subnet CIDR 10.124.43.128/25 If want to connect from public to…
Miantian
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Can fail2ban-client tell me if an ip from a CIDR range is in a jail?

If I have a CIDR like 13.54.63.128/26 can fail2ban-client tell me if there's an IP in this range that's currently banned? Currently I'm doing: CIDR="13.54.63.128/26" nmap -sL -n $CIDR | awk '/Nmap scan report/{print $NF}' | while read ip do sudo…
jaygooby
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Issues with Ubuntu Network Setup

Please, someone tell me whats up here, I am going bonkers, I have used multiple calculators etc, everything tells me the details in the image are correct but ubuntu just will not accept.
Ron Appleton
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