All Questions
23
questions
-2
votes
0
answers
35
views
Modules disappear after reboot
Dear friends something really strange is happening in my system. The ip_tables module did not seem to be installed so I proceeded to reinstall the kernel and all modules:
sudo apt-get install linux-...
- 97
2
votes
1
answer
2k
views
Can't get Chain "MASQUERADE" to work on WSL2 Kernel
I'm trying to build custom Kernel for my specific requirement where I need the chain MASQUERADE to be available. I'm using https://github.com/microsoft/WSL2-Linux-Kernel to build my kernel.
I've set ...
- 121
0
votes
1
answer
2k
views
Huge CPU load under large amount of TCP connections
Under a large amount of TCP connections, one CPU core will always go up to 100%. After that happens, the whole VM would start lagging and there will be an evident packet loss.
Is there a way to solve ...
3
votes
1
answer
8k
views
How to get UFW in Ubuntu 20.10 (Perhaps iptables or your kernel needs to be upgraded) [closed]
This is my Ubuntu 20.10, if I understand uname show wrong version
# uname -r
4.15.0-60-generic
because
# ls -la /boot
total 147492
drwxr-xr-x 4 root root 4096 Feb 11 21:21 .
drwxr-xr-x 19 root ...
- 141
0
votes
1
answer
3k
views
kernel module problem
i have problem with iptable when i trying to run this command iptable -L the output is `
modprobe: FATAL: Module ip_tables not found in directory /lib/modules/4.4.0-186-generic
iptables v1.6.0: can't ...
- 11
1
vote
1
answer
959
views
On new linux kernel 5.8rc7 in Ubuntu 20 docker will not start
I have installed the new Linux kernel 5.8rc (not stable) using the mainline installer. Almost everything I tested worked fine except for Docker which would not start. Looking at the logs the issue ...
- 147
2
votes
0
answers
5k
views
How to load nf_conntrack and nf_nat_masquerade modules in kernel HWE?
I have some iptables rules that require the nf_conntrack and nf_nat_masquerade modules, however these are not available in the HWE kernel (Ubuntu 18.04.3 x64).
Note: They are only available in ...
- 21
1
vote
1
answer
8k
views
How to install this kernel module to use IpTables in Ubuntu 19.04?
So, I am studying IpTables using Ubuntu 19.04 - kernel 5.0.0-32-generic. Following this tutorial https://www.youtube.com/watch?v=ldB8kDEtTZA, I have to load the following kernel modules:
x_tables, ...
- 19
0
votes
1
answer
911
views
package forward low performance and low forward speed in using Ubuntu as router
I have built a router based on Ubuntu Desktop 18.04.1(kernel: 4.15.0-32-generic x86_64).
I followed this guide https://killtacknine.com/building-an-ubuntu-16-04-router-part-1-network-interfaces/ .
...
0
votes
1
answer
1k
views
how to install ip_tables and ip6_tables modules in ubuntu 18.04 kernel 4.4.0?
I'm trying to upgrade from 16.04 to 18.04. I use FireHOL, but FireHOL can't install in 18.04 server, evidently because there are no ip_tables.ko or ip6_tables.ko kernel modules in /lib/modules/4.4.0-...
- 121
2
votes
0
answers
760
views
BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 (Ubuntu 14.04, kernel: 4.4.0-31) [closed]
I get the following "log" output using "crash"
[558679.340881] ip_tables: error: `ERROR'
[558679.344717] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[558679.344779] IP: ...
- 51
1
vote
1
answer
1k
views
Iptables fails to start after reboot
I have an issue with ufw/iptables and the kernel packages of my ubuntu machine The ufw service is not running because iptables is failing to start. Iptables fails because of a kernel issue. After ...
- 13
0
votes
1
answer
2k
views
Iptables rule do not drop all packets [UDP Filter]
I have big problem.. I run cs1.6 game server there was one who flood my UDP port "27015" with many packets. I get these packets and analyzed it and then managed to put rule to block these packets. I ...
- 15
3
votes
2
answers
5k
views
How to know if my kernel of ubuntu is supporting conntrack
I want to know if there is a way to know if the conntrack module are loaded in my Linux kernel.
How to know if my kernel of Ubuntu is supporting conntrack?
- 507
1
vote
1
answer
2k
views
UFW not working in 16.04 server. Refers to earlier kernel module?
I am trying to move our mail server based on 12.04 to a brand new installation of 16.04 server.
When I run sudo ufw status, I get:
ERROR: problem running iptables: modprobe: ERROR: ../libkmod/...
- 41
5
votes
2
answers
43k
views
Can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
I'm trying to open up port 1900 for UDP in order for the Echo to be able to discover the HA Bridge using the following command but I get errors. What is the best solution to fix this?
pi@raspberrypi:~...
- 4,605
1
vote
1
answer
3k
views
Enabling Conntrack for iptables to work on openvz container?
I'm trying to use iptables on my newly purchased openvz container. Everything was going well until I noticed that apt-get wasn't working, looking round I discovered some tutorials which said that ...
0
votes
1
answer
4k
views
How to load a iptable matching module? Or is it required to load it expressly? Some related questions
I am running Ubuntu 14.04 LTS. I believe the following shows which iptables matching modules are loaded:
sudo cat /proc/net/ip_tables_matches
Question: I see conntrack listed three times. Why?
...
- 129
0
votes
1
answer
2k
views
xtables-addon installation failed
I have a server with ubuntu 12.04 and when I try to install xtables-addon with this command module-assistant auto-install xtables-addons-source I get this error
Bad luck, the kernel headers for the ...
- 669
2
votes
1
answer
6k
views
how to enable iptables tarpit?
I'm using ubuntu server 10.04 and I have to enable tarpit module .
I installed the followning packet :
aptitude install xtables-addons-common xtables-addons-source
module-assistant auto-install ...
- 669
-1
votes
1
answer
155
views
IPV6 modules whats really needed?
I've added blacklist ipv6 to my blacklist.conf file to keep the ipv6 module from loading, but there's a lot of other modules related to ipv6 as well that I'd like to know if I can add to the list as ...
- 601
2
votes
5
answers
6k
views
How do I prevent iptables from loading on boot?
I don't need iptables on my computer, since I'm behind a NAT Server and a router. I, therefore, flushed all the rules I had left to disactivate the firewall. I wonder if I could probably prevent ...
- 605
2
votes
1
answer
8k
views
How do I load iptable kernel modules onto a VPS?
I have two servers, using one for prod and one for dev. They are with different providers, and one is running Xen and the other OpenVZ (both running Ubuntu but 8.04 and 10.10 respectively). I've ...
- 121