All Questions
102
questions with no upvoted or accepted answers
1
vote
1
answer
675
views
EC2 instance with two internal IPs - using ifconfig
I am trying to allocate another internal IP to an EC2 (classic - not VPC) instance with the following command.
sudo ifconfig eth0:0 inet 10.80.7.40 netmask 255.255.255.0
Here, 10.80.7.40 is just a ...
- 111
1
vote
2
answers
2k
views
What kind of methods are used to calculate IP ID fields?
I'm doing a bit of research on the methods of generating the ID field of the IP headers.
I have read the sources and other documents and have confirmed that Linux generates a random number for every ...
- 111
1
vote
0
answers
3k
views
iproute nexthop not working - defining multiple default gateways
I have several point to point connections and I’d like to use all of them as default gateways. I saw this link which explains how to do this using load balancing by calling ip route with a next hop ...
- 111
1
vote
0
answers
1k
views
How to redirect a URL to a certain IP, as with /etc/hosts?
Someone on my shared server has messed with some setting such that gethostbyname('www.google.com') (PHP) gives me the IP for his website, rather than Google. I believe this can be done via the /etc/...
- 12.2k
1
vote
1
answer
6k
views
How to change the IPv6 link local address of an interface in Linux?
I want to remove the default IPv6 link-local address of an interface and want to replace it with a customized IPv6 link-local address?
Can you help me here?
If I assign a new link-local IPv6 address ...
- 41
0
votes
0
answers
21
views
How to communicate across network segments?
I have two hosts, A and B, which are connected to the same router via Ethernet.
A's IP address is 192.168.3.100, but I don't know B's IP address.
I want to scan B's IP address through A, but B's ...
- 1
0
votes
0
answers
13
views
WANem Emulator and two VM hosts configuration
enter image description here
The below are the configurations I made ,
`
WANEM IP - 192.168.1.111
255.255.255.0
Client
Windows IP - 192.168.1.10
255.255.255.0
Default gateway - 192.168.1.111
It is a ...
0
votes
0
answers
156
views
Netplan - add secondary IP address and assign a label
I saw the same question here, but I can't find it anymore. How can I add secondary IP address and assign a label to it via netplan?
I have this netplan config:
# This is the network config written by '...
- 103
0
votes
1
answer
155
views
Cannot IP Forward From a Physical Linux Server to a Docker Container Running on Another Physical Server and Vice Versa
TLDR;
I have three servers, Server A, B, and C. Server A and B are physical servers on the same subnet. Server C is a virtual server, a basic WireGuard Docker Compose container running on server B, ...
- 61
0
votes
0
answers
170
views
Why do we need multiple iptables?
In man iptables there are 4 tables defined: filter, mangle, nat, raw. And many of them have the same predefined chain. For instance, nat and mangle both have OUTPUT chain.
The question is why do we ...
- 133
0
votes
0
answers
139
views
How does linux route to an IP address from the routable subnet if the IP address is assigned to a virtual interface on multiple nodes
I see a scenario working that I do not understand (bad luck, I know).
I have a cluster comprising 3 nodes, each of them has a NIC (ens4) with an individual IP address assigned, e.g. 10.10.20.210. The ...
- 1
0
votes
0
answers
372
views
Set a static private IP with systemd-networkd on arch linux
I am using Arch linux and I want to have a static private IP that is always 192.168.1.10.
How do I do this? I am using systemd-networkd and I can achieve the functionality I want by running sudo ip ...
0
votes
1
answer
442
views
How to detect linux device on LAN from Windows
I'm developing an application on embedded linux. User has an option to change the IP address of the device from a web portal.
I have a windows application (built on C#) that can communicate with the ...
- 123
0
votes
0
answers
84
views
OVH new IPv4 address
I have an OVH dedicated server (under Debian 10) with the main IP "149.xxx.xxx.xxx".
I bought a Fail-Over IP and I want the server to take into account this new IP, "58.xxx.xxx.xxx"...
0
votes
0
answers
23
views
How to block internet if one of gateways is down
I have router with VPN client. Sometimes something goes wrong and connecton to VPN is down. I'd like to restrict clients from connection to the internet directly (without VPN) in this case.
Is it ...
- 1