Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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Can someone tell me what 127.0.1.1 is and is this a recent addition? It's not localhost, and it's not the ip on any of my NICs, so what purpose does it serve?
Let me tag on a similarly straightforward question.
On all my PCs, I have a firewall rule, ... accept all connections from 192.168.123.0/24 ... It allows any PC on my router to communicate for purposes of FTP, etc. I used to set the acceptable ip to 192.168.123.0/8 which also apparently worked, but someone told me that was wrong, it should be 192.168.123.0/24
Let me tag on a similarly straightforward question.
On all my PCs, I have a firewall rule, ... accept all connections from 192.168.123.0/24 ... It allows any PC on my router to communicate for purposes of FTP, etc. I used to set the acceptable ip to 192.168.123.0/8 which also apparently worked, but someone told me that was wrong, it should be 192.168.123.0/24
Has anyone seen a thread that explains that?
Wouldn't 192.168.123.0/8 allow anything through from 192.*.*.* whereas 192.168.123.0/24 allows only from 192.168.123.* ? IOW, netmask is 0xff000000 rather than the desired 0xffffff00.
192.168.123.0/8 might considered wrong simply because you have some of the host bits set, but its essentially the same as 192.0.0.0/8. The number following the / is the number of bits used in the network designation.
The number after the slash ("/") is the number of bits that must match in the IP to be tested starting from the MSB. A "/2" would be 0xc0000000, a "/16" would be 0xffff0000 and so on. A bit set ON says the bit must be on in the tested IP. A bit set OFF says that the bit can be either ON or OFF in the tested IP.
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