traceroute | A PHP Traceroute example

I already knew about the "_gateway" variable in CentOS/RHEL (I think up to 7 it was just "gateway", without the _ sign). Today I setup AdGuard DNS server in my home lab, on the same machine is a reverse proxy to serve some internal services, I added a second IP to the host because I needed multiple HTTP ports. Nevermind, I set a wildcard DNS entry on adguard. Like this: *.mydomain.com 172.16.20.60 (which is the IP of the reverse proxy mentioned above) - I didn't want to add all services manually, so I chose the wildcard method.

A few hours later I noticed that the machine that hosts the dns server and reverse proxy wasn't able to connect to the internet.

I did a traceroute and saw that it was trying to reach the internet over _gateway.mydomain.com (which leads to the machine itselfs).

A ping on _gateway.mydomain.com returned the machines IP, so I remembered the wildcard dns entry on my dns server. I added _gateway.mydomain.com to it's correct IP and then it worked as expected.

My question is what is the thing about this kind of environment variable "_gateway"/"gateway" - why does RedHat do this? And I wonder why the network tries to reach it's gateway via a dns name? I wasn't able to find any information about this and didn't find any setting on the machine itselfs to disable this behavior.

Here's some output:

I want to make TCP SYN requests using traceroute and discovered the flag -T. However, I don't know which values I have to use in order to make such requests.

I'm trying to understand this relationship setup on this model, and why is this an issue on Rails 6.

Coming from Rails 3, this relationship is defined as:

ping 8.8.8.8 -t 5 -c1 | awk '{if (/Time.*/) print $1,$2; else if (NR==1) print "from: " $3 " "}'

When i use this line the else if doesn't work, it basically prints from and the ip no matter what first, even before the if conditional. I want it print it only when the TTL is enough to reach the target (Or when there isn't a message involving Time to live exceeded)

This command is basically a traceroute written by me.

I don't know why the else if conditional doesn't work, i would love help.

The whole bash script:

I have a fresh pocketBeagle that I'm trying to update, by sharing my laptop's (windows 10) internet connection over USB. I've been trying to follow these two guides (not much difference between them):

• https://manpages.debian.org/buster/traceroute/traceroute.1.en.html
• https://ofitselfso.com/BeagleNotes/HowToConnectPocketBeagleToTheInternetViaUSB.php

General idea seems to be pocketBeagle takes 192.168.7.2 and uses 192.168.7.1 as default gw As far as I can tell, I've followed all the instructions but I cannot ping anything outside these two connections from the pocketBeagle.

What tests can I do to figure out where the connection is failing?

Current state:

ping 8.8.8.8 never returns from PuTTY, standard windows defender firewall settings

Debian system ifconfig ip 192.168.7.2

My internet connection with network sharing turned on all enabled, selected PocketBeagle (Eth 4)

Eth4's ipv4 config ip 192.168.7.1

Default Gateway in Debian file exists

/etc/resolv.conf nameserver 8.8.8.8

I have a flask app with an index.html that has a submit input that runs a process. I'm trying to catch the error traceroute, then navigate to an error page to display that traceroute from the process if an error occurs. But on the server, my render_template() is not being called.

index.html that has a submit input that runs a process by redirecting to b.html where a method using the Fetch api fetches the mapped path /run, and the process runs. The process runs fine, but if I insert an error for testing, an error is thrown and it sends the following JSON object to b.html:

I'm trying to migrate a legacy app from 3 to 4 (and of course I'll go to 5 and 6 next). Basically it is a helper heavy app, and it encapsulates a lot of the logic on helpers.

I have some trouble loading helpers on rails 4 and I think I sorted it out but I seem to be having issues with nested helpers. I'm using the traceroute gem to validate that the routes on the routes.rb work properly and I'm coming with some issues there.

Example:

I'm wondering if anyone can help with my issue, here's the setup:

• We have 2 separate kubernetes clusters in GKE, running on v1.17, and they each sit in a separate project
• We have set up VPC peering between the two projects
• On cluster 1, we have 'service1' which is exposed by an internal HTTPS load balancer, we don't want this to be public
• On cluster 2, we intend on being able to access 'service1' via the internal load balancer, and it should do this over the VPC peering connection between the two projects

Here's the issue: When I'm connected via SSH on a GKE node on cluster 2, I can successfully run a curl request to access https://service1.domain.com running on cluster 1, and get the expected response, so traffic is definitely routing from cluster 2 > cluster 1. However, when I'm running the same curl command from a POD, running on a GKE node, the same curl request times out.

I have run as much troubleshooting as I can including telnet, traceroute etc and I'm really stuck why this might be. If anyone can shed light on the difference here that would be great.

I did wonder whether pod networking is somehow forwarding traffic over the clusters public IP rather than over the VPC peering connection.

I'm working on a personal project to learn some more Go and hitting a snag (or potentially going about this all wrong too so there is that).

A little background first: I'm working on a simple web app with some form fields to do some basic network tests like curl, netcat, and traceroute. I was looking to use WASM so that I could just modify the DOM with results from the Go app, but I believe due to there being a lot of syscalls, the WASM architecture doesnt support them and I couldnt compile it after a certain point or when it did it was failing anytime I ventured into some of the network pkgs. I couldn't really find another way to use javascript without abandoning Go, so I decided to go with templates.

When a form is submitted it loads a results.html that is identical to the index.html except some Go templating to print the results of the network tests. It works great has a "meh" kinda of way to simulate JS modifications and allow you to do more tests without leaving the page BUT since there are three different network tests, and only one running at one time, I get errors when it can't fill ALL the templates.

So for example