subnet

get subnet mask and gateway from IP address

由 Deadly 提交于 2019-12-10 10:46:15
问题 How can i calculate subnet mask and gateway from an IP address ? Suppose my IP address is 180.12.24.68 Then how can i calculate this IP's subnet mask and gateway? 回答1: You cannot calculate your subnet mask or gateway from just an IP address. You can calculate the range that a potential gateway could be in given an IP address and a netmask. But, the range is basically ((My LAN segment Size) - MyIP). Generally this will be around 253 IP addresses unless you're on a large network. Given a

How to get gateway address when subnetting?

由 我怕爱的太早我们不能终老 提交于 2019-12-09 13:21:06
问题 I have to subnet a network from a single class C IP address. I have figured out the subnet mask and the broadcast address (I'm using subnet mask /28) but don't understand how to get the gateway address. Can anyone help me? 回答1: If subnet mask is 255.255.255.248 then number of masked bit will be 5, hence number of subnets = 2. The power number of masked bits = 2 the power 5 = 32 subnets, and the number of hosts per subnets = 2. The power (unmasked bit or 32- total number of network bits) = 2

How to divide a network into eleven subnets

由 北战南征 提交于 2019-12-08 12:17:46
问题 lets say I have 136.181.0.0 /16 and I want to divide it into eleven subnets I got /19? First it was /16 which has only 1 subnet (actually when subnetting is not yet applied, it is still called Network Address). Borrow 1 bit from the host bits, you get /17 with two subnets. Borrow another one then you'll get 4 subnets and a prefix of 18. Borrow another bit then you get 8 subnets with /19 as the CIDR. not sure about 9th,10th and 11th on here.. 1st 136.181.0.0/19 2nd 136.181.32.0/19 3rd 136.181

Given an IP address and a Subnet, how do I calculate the range of IPs using php

由 为君一笑 提交于 2019-12-08 09:33:29
问题 I have the following code snippet and im trying to detect if an IP address falls into a certain range. Most of the time I have the IP address and the subnet but sometimes I just have the IP address only. <?php function CalculateRange($IP,$Subnet=""){ //Calculate subnetmax if ($Subnet==""){ } //Calculate max IP return $MaxIP; } //--- IP range $IPRange = array ( array("address"=>"196.201.26.0","subnet"=>"255.255.252.0"), array("address"=>"196.202.43.0","subnet"=>"255.255.0.0"), array("address"=

How to calculate netmask from 2 ip adresses in Python

由 冷暖自知 提交于 2019-12-08 08:51:27
How can I calculate the subnetmask in Python if I have the first and the last ip adresses in a range? I want the netmask as e.g. 255.255.255.0. Thanks ;) Say that we have... def ip_to_int(a, b, c, d): return (a << 24) + (b << 16) + (c << 8) + d Then you can have the representation doing a few XORs. Eg. >>> bin(0xFFFFFFFF ^ ip_to_int(192, 168, 1, 1) ^ ip_to_int(192, 168, 1, 254)) '0b11111111111111111111111100000000' So: def mask(ip1, ip2): "ip1 and ip2 are lists of 4 integers 0-255 each" m = 0xFFFFFFFF ^ ip_to_int(*ip1) ^ ip_to_int(*ip2) return [(m & (0xFF << (8*n))) >> 8*n for n in (3, 2, 1, 0

Multiple Ethernet Interfaces - How to create a separate network and access from C code

由 元气小坏坏 提交于 2019-12-07 06:13:49
问题 I have a Linux device (actually a BeagleBoard for the prototype) with two Ethernet adapters. What I want is this: Primary ethernet interface (eth0) connects to a client's network (may be DHCP or assigned a static IP). Second ethernet interface (eth1) connects directly to another Linux board. User-level C programs on the Beagle can listen for incoming connections from the client's network (on eth0), respond as required, and possibly connect to the other device on eth1 We want the second device

Generate Random IP Address

由 萝らか妹 提交于 2019-12-06 17:29:02
问题 I want to generate some random IP Address. But evertime this generateIPAddress function returns 0.0.0.0 string as ipAddress. But it should be returning some random ipAddress other than 0.0.0.0 everytime. Any suggestions why is it happening? private void callingGeoService() { int p1 = 255; int p2 = 0; int p3 = 0; int inc = 5; String ipAddress = generateIPAddress(p1, p2, p3); p3 += inc; if (p3 > 255) { p3 = 0; p2 += inc; if (p2 > 255) { p2 = 0; p1--; if (p1 <= 0) { p1 = 0; } } } } This is the

Granting mysql access rights to all machines on subnet

由 假装没事ソ 提交于 2019-12-06 08:41:38
问题 I have a mysql instance (and schema) running on windows that I can access via a connection string based on localhost as the server. now I want to be able to access this db from another machine on the same subnet. If possible I would like to use a single user but allow it to access from any machine on the same subnet. how do I setup security for this? (I already opened the relevant firewall port) Thanks, Eyal 回答1: You can do it like this: GRANT ALL PRIVILEGES ON mydb TO 'username'@'192.168.1.0

get subnet mask and gateway from IP address

由 十年热恋 提交于 2019-12-06 07:50:11
How can i calculate subnet mask and gateway from an IP address ? Suppose my IP address is 180.12.24.68 Then how can i calculate this IP's subnet mask and gateway? You cannot calculate your subnet mask or gateway from just an IP address. You can calculate the range that a potential gateway could be in given an IP address and a netmask. But, the range is basically ((My LAN segment Size) - MyIP). Generally this will be around 253 IP addresses unless you're on a large network. Given a gateway and a netmask you can calculate a range of potential IP addresses you can configure yourself to use - but

How to store IP address list in C# List to make it searchable for subnets too?

由 ↘锁芯ラ 提交于 2019-12-06 01:52:29
问题 how should I correctly store IP address list with addresses which are subnets to make it searchable? There are two examples: I have IP address 1.2.3.4 and in my C# List there is 1.2.3.4 entry so here we have no problems. I have IP address 3.4.5.6 and in my C# List I have subnet 3.4.0.0/24. Here is my problem. How to store IP subnet in List to cover second example? Thanks 回答1: At the end of this answer you will find a complete implementation of a structure to represent a IPV4 address. Here is
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