Viewing profile — johnnny

t's a limitation imposed by the ping programme itself, it'll refuse to use very short intervals if you're not root. This is documented in the man page. Or, use the source, Luke: ht…

Try:: $ dpkg -S /bin/ping iputils-ping: /bin/ping $ grep 'downloaded from' /usr/share/doc/iputils-ping/copyright It was downloaded from https://github.com/iputils/iputils $ git clo…

They went rouge? As opposed to putting on mascara?

Using DHCP, the same tool that can configure any client computer with addresses and gateways, meaning you hopefully secure that already. Some switches give you tools to mark a few …

Where did you get the idea that anybody on the Internet can? The first step to network booting (PXE or UEFI boot) requires DHCP, which means a DHCP server or relay on your local br…

I work in networking, not particularly close to the hardware. I have colleagues who manipulate IP addresses by looking at the string representation of the address, splitting on the…

Databases too have indexes! Almost as if that makes it easier to search for both machines and humans!

TCP tries really hard to avoid fragmentation, by setting the DF flag and reducing the MSS when it sees a PTB error. Of course that sometimes fails, so if you still have TCP fragmen…

Are they 100% wool? Wooly jumpers, especially when made of fragile merino wool, remain usable for much longer when they are made of a mix that includes plastic fibers (maybe 75% me…

If you allow infinitely long descriptions, then I don't know what's the score. In the case of "descriptions" that amount to (potentially infinite) decimal expansions, I think an ar…

> But that set must have a member whose value is closest to zero This is not true for real numbers with the usual "less-than" relation. In fact, considering real numbers, no open s…

The set of numbers that can be written with a finite number of 0-9 digits is countable. That set is called the decimal numbers, and is a subset of the rational numbers which itself…

As fro your further edit: assuming √2 is rational, then the set of ~~rational~~ integers {q: q√2 ∈ ℤ} does not admit a minimum, indeed it contains arbitrarily small numbers, so we …

k * √2 is an integer, and k is an integer, by construction of K and the initial assumption that K is not empty. Therefore their difference k * √2 - k = k * (√2 - 1) is an integer.

I have heard of an anecdote that in some company, can't remember which, when meeting to take a decision, they would have people speak up in order of seniority, from the most junior…

I'll repeat myself: it's very obvious in context that they meant the positive solution of xˆ2 = 2. My definition of the square root is as follows: the square root of a positive rea…

It's very obvious in context that they meant the positive solution of xˆ2 = 2. My definition of the square root is as follows: the square root of a positive real number x is the po…