New answers tagged

1

The answer is too late, but you probably want this one: https://github.com/Jamesits/linux-gre-keepalive If you are interested why setting accept_local helps, here is an answer: https://bv2ex.com/t/588215 A GRE Keepalive is a "host to router" GRE packet encapsulated inside a "router to host" GRE packet. The idea being the host (in this ...


1

Yes, it's better. That way, all configuration is managed in one place, and not spread out to individual servers. It makes reconfiguration a lot easier. In addition; what components really need static IP's these days? Most can be handled by DNS updates.


1

you can not reach dummy0 because the interface is down, as you can see on you command ip addr show dummy0 --> state DOWN the interface is down because its a dummy so there is no real way to know its state because it is not really connected to any network. you can force the interface to up with sudo ip link set dummy0 up then you can ping you own ...


1

Short answer, Yes. Ports are an addressing attribute of TCP and UDP transport protocols. While 98% of Internet traffic uses one or the other, not everything does. The traffic that doesn't use them does not have the concept of ports. When a computer receives an IP packet, it has to check to see it the address is one that it accepts (i.e., if the packet is ...


2

Since public DNS resolvers can be used in for example DNS amplification DDoS attacks most properly managed ISP's and networks limit access to their resolvers. They will have firewalls and other security mechanisms to ensure exclusive access to their own networks & customers. And you won't be able to query them remotely. Additionally I think that ISP's ...


0

Here is an example of my problem: (which seems to be OP's problem from what I'm reading) tracert www.cisco.com Tracing route to e2867.dsca.akamaiedge.net [2600:1406:40:584::b33] over a maximum of 30 hops: 1 * * * Request timed out. 2 * * * Request timed out. 3 * * * Request timed out. ...


0

BTW: This works with BusyBox versions of the commands too. For anybody else looking for an answer to this, you can grep -n the range, cut the line number, then pass that to the sed command to delete the line. There are a couple of ways to do this (single line or one step at a time with variables), but here is the onliner: grep -nm1 "^192.168.254.0/24&...


1

If you just want the hostnames/ips and don't want the other info: sudo nmap -sS -p 22 192.168.1.0/24 | grep report


1

It seems to work with the following script. An extra feature that was not present in my original question is how to keep the interface in both main and new namespaces (but I will deal with that later). Following is quite descriptive solution based on the information provided in: here, here, here, here, here and here. # Save default settings to files for a ...


0

Using IGNORE causes trouble with mail signing filters, such as OpenDKIM. So, postfix documentation suggests us to use REPLACE clause instead. See the documentation for REPLACE clause usage. Step 1: Create a regular expressions file in /etc/postfix/header_checks and add the following information. /^Received:.*with ESMTPSA/ REPLACE Received: You can't see me ...


0

if I understand correctly you need VM1 to act as a router because this VM is able to reach the sip trunk and also VM2. VM2 is able to reach sip IP of VM1 but not the second sip IP on that /30 subnet.. On VM1 - first of all make sure your iptables FORWARD policy is set to accept and that Kernel IP forwarding is enabled : # sysctl -w net.ipv4.ip_forward=1 if ...


0

This issue and diagram is helpful for understanding the "big picture": https://github.com/nodejs/node/issues/9390#issuecomment-278001837


Top 50 recent answers are included