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When running "arp -a" on a linux machine, one of the values for each entry returned is "Flags." I've seen 0x0, 0x2, and 0x6 as possible values. All I have gathered so far is that 0x6 represents a permanent (ie: static and not dynamic) entry.
Is there a list somewhere of all of the possible flags for an arp cache entry? Can there ever be more than one flag for an entry?
The answer can be found here (the question "Definition of Arp result flags?"): https://superuser.com/a/822089
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Closed 6 years ago.
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i found something on my linux systems i don't understand.
The files /var/spool/mail/root and /var/mail/root point to the same inode but the link count is 1. This is the same on a ubuntu and a centos server.
When i create hardlinks to a file the hardlink count increases with every new file.
Why is the link count just one?
That is because /var/mail is a symbolic link to /var/spool/mail.
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Closed 7 years ago.
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I'm trying to make files in my linux virtual server browsable from my windows. I'm following the instructions given here: https://help.ubuntu.com/lts/serverguide/samba-fileserver.html
However, I cannot find the security parameter it's talking about. Can I just create that anywhere under the [global]? Or is there a pretty specific place to put it?
Yep, you can just specify the "security=" parameter anywhere in the global section.
https://www.samba.org/samba/docs/man/manpages/smb.conf.5.html
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Closed 8 years ago.
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I want to modify sched.h to add in some scheduling algorithm. I use find / -name sched.h command finding a lot of results.But which one should I really modify ?
And in /usr/src,there are a lot of relating folders whose names are similiar. I'm using ubuntu14.04. Where are my real source code?
use uname -a to see which kernel you are currently running. After that, i would edit the /include/linux/sched.h for that kernel.
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Closed 8 years ago.
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We know Linux LV has active and inactive status. What's the difference between these two status?
Well...I google-d a lot these days and also referred to some books and documents,
1. If a LV is in active state, but not in a mount state, it can be seen by the Kernel, or
Kernel processes/threads can still use this LV.
2. If a LV is in inactive state, it cannot be available by the Kernel.
Hope that helps. Thanks.
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Closed 9 years ago.
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I wanted to know what exactly does happen to a packet by the time it goes to a linux kernel, until it comes out of kernel and goes as application layer.
There is a nice paper PATH OF A PACKET IN THE LINUX
KERNEL STACK(pdf), with examples and links to the kernel source code.