All Questions
29
questions
-2
votes
0
answers
23
views
Ping IP Linux Ubuntu
PT-BR
Estou utilizando Ubuntu e preciso descobrir a latência de um IP de um subdomínio. Tentei primeiramente o comando "ping", mas sem sucesso. Também tentei chegar se a porta 53 e 80 ...
0
votes
1
answer
270
views
Using Ubuntu 22.04 as DNS Server with bind9
I want to use a simple ubuntu 22.04 server as a DNS Server for my pc.
I created a new server, with a static ip address, that i will type in to my dns in windows.
My problem is, when i try
nslookup ...
- 1
1
vote
0
answers
95
views
Strange UFW Block Logs
i noticed repeats of the following logs in my server:
Dec 3 21:55:27 alice-server kernel: [287677.084885] [UFW BLOCK] IN=ens18 OUT= MAC=01:00:5e:00:00:01:90:9a:4a:dc:31:62:08:00 SRC=192.168.0.1 DST=...
- 11
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
0
answers
154
views
Unable To Connect To Internet Sites Via Live USB - Wi-Fi Settings Are Correct
I was running my Ubuntu Live via USB for the first time. All of my Wi-Fi settings were correct and I was able to get a DHCP address on my network but I was unable to get to any Internet URL including ...
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
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
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 ...
0
votes
1
answer
4k
views
UFW allows outgoing IPv6 even when default policy is to deny all outgoing
I want to set a policy to deny outgoing connections by default.
DNS lookup should be allowed
Specific IPs should be allowed for outgoing connections
So I setup the following rules:
sudo ufw default ...
- 103
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
0
answers
3k
views
Cant ping with UFW enabled
I am having an issue with UFW on Ubuntu 20.04. I am running a Nextcloud server on this machine, and my default is to deny incoming and outgoing, except for port 443 which works fine. This is causing ...
- 35
1
vote
1
answer
536
views
Ubuntu 18.04 can't ping outside IPs or domains
I recently created a cloud Ubuntu 18.04 server and I am unable to ping outside IPs. My network (from my understanding) is managed by netplan.
Attempts to ping or curl
$ ping google.com
PING google.com ...
- 186
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
2
votes
1
answer
439
views
Cannot browse to sub-domain
Using Firefox on Ubuntu18.04, and I somehow must have messed up some internal tables, for I'm unable to reach a sub-domain. I tried with Chromium, to no avail (DNS_PROBE_FINISHED_NXDOMAIN). The ...
- 175
0
votes
1
answer
4k
views
Allow port 53 for a DNS server
I am trying to use my ubuntu machine as DNS server. I have installed the bind 9 package.
I am using dig to check the DNS server. However I am getting a ICMP type 3 code 3 message on the client.
This ...
- 301
0
votes
2
answers
4k
views
DNS Resolution fails with UFW & OpenVPN (ProtonVPN Server)
I have an issue I've been trying to solve for a few days now - I'm working on a relatively fresh installation of Ubuntu 18.04, I enabled UFW and configured it with the following rules.
sudo ufw ...
- 1
1
vote
0
answers
58
views
Cannot access apache form outside network
I cannot access apache from outsid the network. From "inside", it works.
In the Firewall "Apache Full" is enabled.
sudo iptables -vL
Returns this:
Chain INPUT (policy DROP 4 packets, 144 bytes)
...
- 111
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
0
votes
0
answers
108
views
stop systemd DNS madness
I'm running a server on the Internet with LXC containers. Thus I need some kind of internal naming and the venerable DNSmasq has been replaced by further extensions of the devil himself (systemd) :)
...
- 2,077
1
vote
1
answer
6k
views
Opening port 53 for DNS
I am running Ubuntu Server 16.04.3 LTS and am attempting to set a DNS server up. The DNS server is running in a virtual machine and is working when I run dig/netstat against it. However it is ...
- 113
0
votes
1
answer
896
views
UFW rule and website
I am running an ubuntu server with pihole DNS server and OpenVPN server on it. I am running it on the internet so I wanted to protect it with ufw.
So following is my configuration for the ufw. ...
- 101
0
votes
1
answer
192
views
Shocked, content of my webroot on localhost could be seen on www
I am new to this forum, and in doubt where to ask this question, so please guide me if this is not the place to ask.
Well, I got shocked today, I realised that the content of my /var/www/html folder ...
- 77
0
votes
1
answer
508
views
Need help setting up Ubuntu 14.04 Router/firewall
This is my first post here.
Out of desperation - despite reading lots and lots of step-through guides, tutorials and other threads with similar problems - I can't seem to get my Ubuntu 14.04 LTS ...
1
vote
1
answer
2k
views
Block IP beginning with, U.F.W
Someone is running a registration bot on my site and I have taken steps to prevent the registration, but now I want to block the whole IP range from even being able to access my site.
I have set up ...
- 145
0
votes
1
answer
379
views
How to resolve multiple hosts inside a NAT firewall
My apologies if this has been asked before, but I can't seem to find a complete solution.
I have a hosted sub-domain at no-ip.com with a wildcard DNS option enabled. On my end I have a firewall port-...
- 722
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
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