NIC locks up for no reason (?)
Christos Chatzaras
chris at cretaforce.gr
Wed Jun 13 07:33:28 UTC 2018
No firewall is enabled by default.
Use the console and see the output of:
dmesg
also check /var/log/messages during the outage.
> On 13 Jun 2018, at 04:28, Ronald F. Guilmette <rfg at tristatelogic.com> wrote:
>
>
> I am experiencing a really rather odd problem, and could use some
> helpful advice. I'm sure there is a good explanation for why this
> is happening, but at the moment I have no idea what it is.
>
> More than a month ago, I got myself a shiny new VM on one of the
> many providers of such on the Internet. I loaded up 11.1-RELEASE-p9,
> fiddled sshd so that it would run on a somewehat obscure unused port.
>
> Anyway, after doing the above things, all was running well, and exactly
> as expected for some time thereafter. (I have mostly just been using
> the box for some obscure research purposes.)
>
> I never set up any kind of filewall on the thing because frankly,
> I was doing so little with the box I didn't think I'd need one.
>
> Recently, I decided to install and run apache24, which I did.
> I configured that also to run on a non-standard port, since my
> intent was that the web stuff it would be serving up would only
> be stuff that I and perhaps a few close friends would look it.
> Apache started up just fine, and I was able to acces web content
> on the box via the non-standard port, from a system elsewhere on the
> Internet. No problem.
>
> Anyway, now it appears that the NIC on this VM system is effectively
> locking up from time to time, and I have no idea how to even begin
> to debug this problem. This happened a few days ago, and I managed
> to get to a virtual console, I logged in as root, and then I rebooted
> FreeBSD on the VM and again, all was well... for awhile.
>
> When this problem occurred before, it appeared that the (virtual) NIC
> of the VM was not accepting -any- packets from outside.
>
> Now the NIC has locked up again. Once again, from the outside it
> appears that it isn't responding to pings. or to traceroutes, or to
> ssh (on my non-standard port), or to attempts to telnet to the
> (non-standard) HTTP port I'm using.
>
> Traceroutes -out- from the VM also get absolutely nowhere... not even
> one hop. Pings rom the VM to its own (externally routable) IPv4
> address work fine.
>
> I logged in again via the virtual console and once again, just like
> the last time this happened (a couple of days ago), I can see nothing
> obviously wrong. There's plenty of free disk space, and top is showing
> the CPU as being >95% idle.
>
> ifconfig output looks perfectly normal to me... the interface in
> question is listed as "UP".
>
> Whet the devil could be wrong?
>
> The relevant hosting company has assured me that they haven't been doing
> anything new or special lately.
>
> The Handbook says that (recent vintage) FreeBSD provides three different
> flavors of firewalls. Are any of these three enabled by default? What
> about TCP Wrapper? Is that enabled by default on an out-of-the-box
> install of 11.1-RELEASE?
>
> What else could possibly explain a NIC periodically becoming totally
> unresponsive... at least from the outside... apparently just because
> I had the audacity to install and run apache24?
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