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Jul
16
comment Low level system call
You can't, because it's not part of the C standard :p. IOW it depends on the cpu architecture, e.g. x86 or ARM, and has to be written in assembly language. Ref syscall(2)
Jul
15
comment Ubuntu 12. 04 Firewall for Browsing
In particular I would tend to read it as "I am a conscientious user who would attend to the nags to enable a firewall on Windows. So it surprises me that it's not enabled by default on Ubuntu. This sounds like it needs some geeky configuration that I don't have knowledge of - what do I need to do?"
Jul
15
comment Ubuntu 12. 04 Firewall for Browsing
Why on hold? I know security is a broad field. However the question referred to very specific terms of art, and can be answered trivially with reference to those terms. See below.
Jun
30
comment How do I enable IPv6 inbound traffic to get forwarded to my machine?
Heh, that rant of mine was begging to get out for a while. It sounded at least like you weren't 100% confident about what was happening & why. (Of course it's right not to be 100% if you're not yet comfortable with the code). I have difficulty with answers that could be "here's the exact code, maybe I have no idea why and just copied+pasted it". Tho for someone in your position my answer was probably just as bad in that respect :).
Jun
29
comment Capture web traffic grouped by individual TCP streams
(in Wireshark presumably using right click -> "follow tcp stream")
Jun
29
comment How do I enable IPv6 inbound traffic to get forwarded to my machine?
If you're note sure which rule causes the drops, iptables --list --numeric --verbose might help - it shows counters for each rule.
Jun
29
comment How do I enable IPv6 inbound traffic to get forwarded to my machine?
I don't think you've said what your system is (distribution name, version, machine type). Maybe the distro is implied by the name of that config file, but it would be best to be explicit :).
Jun
28
comment How to force systemd enter in emergency mode?
The "in use" error could also happen if there are sub-mounts under the btrfs mount point. Looking at man systemd.mount and man systemd, systemd might be handling that automatically.
Jun
15
comment Cannot install Ubuntu on EFI/GPT scheme
Sorry, I missed "This message appeared when I tried in the BIOS to change SATA from ISRT to AHCI". That sounds like an really bad idea on an installed system. At least, the other way round would be, and I bet the docs don't recommend this direction either. Hmm.
Jun
15
comment Cannot install Ubuntu on EFI/GPT scheme
But gdisk shouldn't assume to look at the 'final sectors'; it should find the "backup header" (heh) based on the offsets in the main GPT. How could you get that gdisk error without corruption (possibly corruption caused by fakeraid)?
Jun
15
comment Cannot install Ubuntu on EFI/GPT scheme
Good idea, and thanks for sharing your experience. In this case the`gdisk` error is coming from sda, not a dm/md device. So I guess the idea is not that the final sectors are 'missing', but they come 'too early' because the end of the device has been reserved for a RAID trailer.
Jun
5
comment Problems with accessing files on a Sansa Clip mp3 player
I've read that MSC/MTP issue about Sansa players in particular.
Jun
4
comment it takes too long to connect to ssh server
Yep, that's right about ping.
Jun
3
comment it takes too long to connect to ssh server
If you haven't already, I would also double-check one or two normal lookups on the VMs. Since it works correctly on the host, I don't think it's a problem with your ISP (or your local router). I'd say both your VMs are fine, it's VirtualBox that's broken (especially as they provide specific packages for each revision of Ubuntu). Whether that's a misconfiguration on your specific system, or a bug that needs fixing in VirtualBox? I don't know, sorry. Presumably there's a VirtualBox community forum you can sign up and get flamed at :-).
Jun
3
comment it takes too long to connect to ssh server
One suspicion is that VirtualBox almost certainly has an integrated DNS server, and it could be buggy somehow. Another would be an old buggy DNS relay software (I've seen some badness on outdated DNSMasq) is running on your home router.
Jun
3
comment it takes too long to connect to ssh server
2. Note that dig does not refer to /etc/hosts. If /etc/resolv.conf lists the same nameserver on both VMs, I would expect dig -x 10.0.2.2 to timeout on the debian VM as well. And the same would apply to the host system i.e. the one VirtualBox is running on.
Jun
3
comment it takes too long to connect to ssh server
Ah, I missed two things. 1. the check SSH is running is not expected to cause a delay even if the reverse mapping is missing. The DNS should immediately return an empty answer, and the client would not retry the query. Your problem isn't like the particular ISP incompetence I referred to in the answer, if that's what your phrasing meant.
Jun
3
comment it takes too long to connect to ssh server
Ok. The hosts file is used for reverse lookups as well as normal lookups, so that probably is what causes the difference. Are you saying the VMs are using an ISP DNS server, i.e. if you look /etc/resolv.conf it does not show an IP address in one of your own network ranges like 10.0.2.2 ? If so, then yes, it is ISP incompetence. (And by implication they're unlikely to be competent to fix it on advice of a single consumer. So you get to work around it yourself. In which case, e.g. installing unbound as a recursive resolver on the host machine would be a good idea in general).
May
27
comment it takes too long to connect to ssh server
It sounds to me like "UseDNS no" on the server should avoid the delay. (I often notice the delay when using ssh locally in the absence of working DNS). Is that the case or not?
May
22
comment Kernel panic when passing noatime in bootargs
I see the documentation you linked is also dated 2003. So you could make that argument. If this was a common problem I'd blame the kernel for being inconsistent instead. In practice... if you keep reading the thread it suggests that using an initrd/initramfs to mount the rootfs instead could work around it, and initramfs is the common case nowadays (at least for non-embedded). My search also brought up specific complaints that this problem happened when booting without an initramfs. Which I should have mentioned if I wasn't being lazy. Eg bugzilla.kernel.org/show_bug.cgi?id=61601