All Questions
33
questions
1
vote
1
answer
156
views
BIND9 on Ubuntu 20 - Cannot configure Zone to work properly
I installed it on Ubunto 20 and configured two zones
Options config file
acl internal {
localhost;
localnets;
192.168.70.0/24;
10.200.157.0/24;
};
options {
...
- 11
0
votes
2
answers
785
views
Generate iptables rules while connecting to VPN Server
I'm building a virtual Ubuntu Server(LXC on Proxmox) that shall act as router and tunnel some devices(e.g. AppleTV) of my local network through a VPN (expressVPN).
Connecting and routing to different ...
- 1
1
vote
0
answers
582
views
DNS only works when I have a port 53 UDP outbound rule *AND INBOUND* rule
I'm locking down both inbound and outbound ports with
iptables -P INPUT DROP
iptables -P OUTPUT DROP
Then, I allow certain traffic to certain servers
SSH from my network to the server (inbound)
HTTP ...
- 181
1
vote
1
answer
88
views
DNATing DNS requests that aren't going to a particular server. iptables : No chain/target/match by that name
I have some chains that I create in iptables
iptables -N dns-requests
iptables -N wg0-filter
I then create a filter, to pass DNS traffic that are on Port 53.
iptables -A wg0-filter -p tcp --dport 53 -...
- 181
0
votes
0
answers
428
views
I wanted to allow outgoing DNS traffic while OUTPUT is on DROP
I currently have a dns server running on my pi , and I am using that as my dns
I wanted to ping google.ca while my output chain / input being on drop
here are my firewall rules would love to hear some ...
- 1
0
votes
0
answers
87
views
help with dns name conflict vpn and docker
I need to access an url via VPN, (estrelaoriente.com)
but seems it is conflicting with an docker route (docker.amazee.io):
~$ ping estrelaoriente.com
PING estrelaoriente.com.docker.amazee.io (127.0.0....
0
votes
0
answers
154
views
Iptables block ping from another ip
I am a beginner in the field could you help me please
me : 192.168.15.13
user1 : 192.168.15.14
user2 : 192.168.15.12
I would like to block ping from user1 to user2 using iptables from my ip 192.168.15....
- 1
0
votes
2
answers
831
views
WiFi AP's have no internet connectivity after seting up IPTABLES
I have set up an Ubuntu 20.04 SERVER to act as a Gateway/Router.
Now that the gateway is functioning, I now no longer have WiFi access via several AP's in my house.
I am able to connect to the AP's, I ...
0
votes
0
answers
157
views
How to test to see if packets are moving between two ports on a dual port NIC
I'm trying to set up a home router on Ubuntu 20.04 Server.
I have followed dozens of on-line tutorials, and for the life of me, I can't get this to work.
As soon as I get everything set up, nothing ...
0
votes
0
answers
331
views
Ubuntu firewall issue
I've broken my ubuntu's dns/firewall settings. I've installed toroxy and dnscrypt and after its deletion I don't have an internet connection even to my router.
ping 192.168.100.1 # router address
ping ...
1
vote
1
answer
166
views
Why is wlo1 not routing DNS response back to enp4s0?
I'm sharing my wifi connection (wlo1) via ethernet (enp4s0) to another device. The packet forwarding worked until the host device rebooted.
All routes and IP addresses are static, set up using NMCLI.
...
- 336
1
vote
0
answers
241
views
What should my /etc/network/interfaces look like
I’ve relatively new to Ubuntu/Linux and have been mainly following online guides to achieve what i would like.
I think however, i have currently messed up my /etc/network/interfaces
When I restart my ...
2
votes
1
answer
3k
views
systemd-resolved iptables rules
Before systemd-resolved my iptables rules for DNS were
DNS_SERVER="8.8.8.8 8.8.4.4"
echo "Set default INPUT policy to 'DROP'"
$IPT -P INPUT DROP
for ip in $DNS_SERVER
do
echo "Allowing DNS ...
- 159
3
votes
0
answers
5k
views
how to properly install and configure stubby on a ubuntu server
This is what I have done, according to this instructive: Protect Your DNS Privacy on Ubuntu 18.04/20.04 with DNS over TLS, but it does not work in my localnet. What am I missing?
Install stubby on ...
- 2,210
2
votes
1
answer
2k
views
How to allow DNS lookup with iptables on Ubuntu 18.04 server
I'm using Ubuntu 18.04 Server and trying to make a router.
When I execute the following iptables script (which worked just perfectly on Ubuntu 16.04), the DNS lookup from command line stops working. I ...
1
vote
2
answers
938
views
Setting and configuring a firewall
Newbie here.
I've found the following rules to set a firewall, (from the book how Linux works)
iptables -P INPUT DROP # the default policy
iptables -A INPUT -s 127.0.0.1 -j ACCEPT
iptables -A ...
- 149
1
vote
1
answer
1k
views
IPtables DNS conflicts
On my VPS, when I run
ping 8.8.8.8
It works just fine, but when I do
ping google.com
it just hangs. The contents of /etc/resolv.conf is:
# Dynamic resolv.conf(5) file for glibc resolver(3) ...
- 3,798
1
vote
0
answers
45
views
Headless server no longer routing after minor fiddling with DNS and DHCP
Apologies up front for any spelling errors or anything, but I'm forced to write this post on my phone.
I'm running ubuntu 16.04.2 LTS headless which I also use as a router for my LAN. Typically I ...
- 11
0
votes
1
answer
141
views
How do I block all analytic websites?
Recently, I have realized that doubleclick is not blocked by firefox ad blocker because google is sponsoring this add-on.
How can I properly block any google analytic and google doubleclick (or ...
- 11
1
vote
0
answers
102
views
WCCP + SQUID = client browser "This page can’t be displayed"
I implement this scenario:
ISP <==> ASA <==> SWITCH <==> LAN + SQUID
Squid server is within the same INSIDE ASA Interface but different VLAN.
tcpdump -nni wccp0 -p tcp and port 80
...
1
vote
1
answer
3k
views
Accidently flushed iptables - restore
Im running ubuntu 16.04 and i have accidently flushed my iptables while trying to troubleshoot a slow internet issue. I used following command
iptables -F
Now i cannot open any website, log into ...
- 185
1
vote
0
answers
112
views
Resolve domain names to IP's based on physical adapter
System Configuration
eth0 NIC to the LAN/WAN/Internet (working, don't want to mess with it)
eth1 NIC
eth2 NIC
Objectives
Assign a static IP to eth1 and eth2 and assign IPs (DHCP) on separate ...
- 111
1
vote
2
answers
5k
views
How do I allow DNS through interface filtering using iptables in Ubuntu Headless
I've seen some questions referring to static DNSs, openVPN server pushes etc, but none of them really apply or they require GUI tools and I am using a headless Ubuntu Core that I SSH into.
root@...
- 378
1
vote
0
answers
3k
views
Dnsmasq and Iptables for routing
I'm using a Raspberry Pi with two ethernet ports as a router. The network looks like this.
"Internet" <--(…)--> Fritz!Box <--(172.16.x.y)--> [eth1, dhcp] Raspberry Pi [eth0, static] <--...
- 1,585
2
votes
1
answer
183
views
DNS not resolving on same network only from outside - 3 days of headache already
I have a domain forwarded to my apache server let's say test.example.com.
This works fine outside my home network I can reach it via mobile (4G).
But on my laptop I can't reach it. Also I can't ...
- 41
5
votes
2
answers
19k
views
iptables - redirect DNS queries
I already have the following iptables rules applied in order to masq all of the wlan1 traffic through wlan0.
*filter
:INPUT ACCEPT [48:6144]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [47:6078]
-A INPUT -i ...
- 91
0
votes
1
answer
1k
views
The server cant resolve host names
Please help with the following problem.
Server is running under Ubuntu 14.04 server 32x.
IP tables:
INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0]
-A INPUT -p icmp -j ACCEPT
-A INPUT ...
- 11
5
votes
0
answers
10k
views
Using Ubuntu 14.04 as router with iptables, clients can't go online. Probably DNS issue, iptables setting needed [closed]
CORRECTION 3: SOLVED! I needed to add the the official DNS server of my departement's VLAN as DNS to the clients.
I've read through a large number of posts about iptables issues when using Linux as ...
- 150
2
votes
0
answers
4k
views
Not pinging with host-name and can't ssh using hostname [duplicate]
I have setuped a DNS server in Centos6.5 and its working with every client machines other than ubuntu, now i have issue with ubuntu
While im trying to ping from desktop machine to DNS server as ping ...
- 6,454
0
votes
1
answer
3k
views
Iptables and bind9 to forward to google's dns
Hello i have a very hard time on getting along with iptables and bind9 as my internal network dns server.
It's configured to forward my queries to google's dns (8.8.8.8).
The main problem is i can't ...
- 101
3
votes
1
answer
17k
views
Redirect requests mapped to a DNS IP Address
For this command lines:
sysctl net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING -p tcp --dport port -j DNAT --to-destination ip:port
iptables -t nat -A POSTROUTING -j MASQUERADE
I can reroute ...
- 31
7
votes
2
answers
32k
views
'/etc/hosts' , http links are redirecting, but https links are not redirecting
I edited /etc/hosts file and entered below information :
127.0.0.1 test.com //working
127.0.0.1 https://test.com //not working .
from the above info, http://test.com is redirecting to 127....
user1506361
5
votes
3
answers
46k
views
How do I allow all possible IPs for Gmail servers through my ufw firewall?
I am currently using the following rule:
ufw allow out from my_local_ip to any port 587
This is a little too lax for my liking. I would like to tighten it up and restrict it to only gmail's smtp ...
- 163