Questions tagged [network-security]
The network-security tag has no usage guidance.
56
questions
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What is the proper way to block entire TLDs using iptables?
With new TLDs being approved like .zip that could be extremely malicious, it seems prudent to have the ability to block entire TLDs on tap. What is the proper way to do this in iptables?
- 109
-4
votes
1
answer
58
views
Is there any way to access Hyper-V host from a network adapter not shared with host? [closed]
I am considering to move my firewall inside Hyper-V. There will be only one Guest OS that is connected to the virtual Switch, and the guest OS is the Firewall OS. While the second adapter at the ...
- 608
0
votes
1
answer
141
views
Is there a way to exclude a network interface from being bound via INADDR_ANY?
In network programming, it's common to pass INADDR_ANY (or IN6ADDR_ANY) as part of the second argument to bind(), telling the networking stack that you want the socket to receive connections/traffic ...
- 1,323
0
votes
0
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99
views
A member was added/removed to a security-enabled local group SharePoint search server
Hello all This action happened every time at 06:00 AM on SharePoint Search Server and I dont know why this event happened by SP.Farm domain user (Administrator user on the server). Anyone can tell me ...
- 109
4
votes
1
answer
1k
views
VPN instead of VLANs
My network have about 8 thousand user, who work in multiple buildings. There is frequent employee turnover, which currently forces changes in the configuration of vlans on the switch ports. In ...
- 41
2
votes
2
answers
1k
views
DigitalOcean Network Firewall allowing SSH connections on ports other than only 22
I have a droplet on DigitalOcean with IPv4 and IPv6 enabled. The droplet is behind a digital ocean network firewall with the following rules:
Inbound:
SSH TCP 22 All IPv4, All IPv6
HTTP TCP 80 All ...
- 158
1
vote
0
answers
558
views
Wireguard VPN not making handshake
I'm facing a trouble, I have a server with Wireguard configured, with the keys generated by wg command line.
I've downloaded Wireguard for windows and put the public's server key on client peer, and ...
1
vote
1
answer
1k
views
Where does Ubuntu log TCP connections?
When doing some network security checks (on which I am an amateur) for my office PC, I discovered a few unknown tcp6 connections (with netstat -nt):
Active Internet connections (w/o servers)
Proto ...
- 113
0
votes
0
answers
44
views
Google Cloud IDS endpoint timing out when creating
When creating a cloud ids endpoint, i keep getting an internal error 500. I'm doing everything according to this documentation https://cloud.google.com/intrusion-detection-system/docs/configuring-ids#...
google-cloud-platform
1
vote
1
answer
228
views
Blocking SSH access from WAN side of CISCO 890 to management plane
I've been round about the houses with this one for days, i've not found a solution yet that works. I haven't found a way to block the HTTP access to the management plane either, i had to give up and ...
- 121
0
votes
1
answer
203
views
Chrome ignoring local dns replies
Am having a local network with about 300 devices some is domain connected and some are not
I have windows server 2012r2 sith dns role
Domain connected users can access local iis webpage while others ...
0
votes
2
answers
707
views
Best way o allow only 2 countries IP acces server
i have a VPS with apache2 and 3 virtual hosts, i see a lot of ips trying to accees resources that does not exist, i also see a lot of ssh incorrect users and password tying access he server, so I need ...
- 1
0
votes
1
answer
115
views
How many Domain Controllers might a Windows Client send LDAP Ping to when trying to locate a DC for Authentication?
I'm a cybersecurity researcher, studying netflow patterns to learn about reflective DDoS events that leverage CLDAP as a UDP reflection vector. I need to be able to distinguish between a windows ...
- 439
0
votes
0
answers
24
views
Creating Trusted hosts on D-Link DGS-1510-20
I'm trying to setup my D-Link DGS-1510-20 so that they can only be managed from specific IP addresses.
I assume I use "Trusted host" under "Security", but nothing there seems to ...
0
votes
0
answers
133
views
Is IP Spoofing still a thing in 2022?
I'm trying to understand if IP Spoofing is really possible in 2022.
I generally found old documents which explains how you cannot trust the source IP for UDP
connections and for the first SYN packet ...
- 11
0
votes
1
answer
37
views
Some ports in my IP direct to unknown server
Backgrounds
I have a dedicated server(which is a desktop) running in my office. It has static IP and was running for about 5 years now with out any network problems. However, after the office had a ...
0
votes
1
answer
418
views
Access control rely on nftables, WireGuard and Reverse Path Forwarding only
I have an idea to host a web app that without built-in authentication on my server. And protect it by nftables, WireGuard and Reverse Path Forwarding only. The web server will listen to the server's ...
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0
votes
0
answers
339
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When is mapUser required -
I'm not sure I understand when & why mapUser is needed.
When you generate a keytab with ktpass you can map the Service Principal to a user wit mapUser. You can then kinit to the Service from an ...
0
votes
1
answer
174
views
QEMU/KVM: how to protect monitor access?
Runing QEMU/KVM with monitor: kvm ...some_parameters... -monitor unix:/my_path/my_fifo,server,nowait
We can then connect using socat - UNIX-CONNECT:/my_path/my_fifo then type commands.
Easy and handy.
...
- 1,663
0
votes
1
answer
27
views
mongo secondary node - weird log entries
I have mogodb cluster with 4 nodes, all nodes work on standard 27017 port. I found weird things in my mongod.log on a secondary node:
{"t":{"$date":"2022-03-26T23:22:34.593+03:...
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votes
0
answers
673
views
Domain computer connected to non-domain computer share giving a lot of login failed event 4625
I have an application running on a domain joined Windows Server 2019 server called AppSrv that writes images out to a non-domain DMZ Windows Server 2019 server called WebSrv. A drive is shared from ...
- 442
0
votes
1
answer
99
views
How to allow outbound connections only for updates
I have a network with a number of VMs hosting applications mainly for internal use, but they are also exposed to the internet via Traefik. Because there is a chance one of them will be hacked ...
- 101
0
votes
1
answer
731
views
How to block .git Folder serverwide on NGINX?
I have a question about blocking the .git folders server wide on a NGINX system.
At the moment I'm playing around a little with NGINX, I actually use Apache.
In Apache, it's actually no problem to ...
0
votes
2
answers
657
views
Should server be hidden behind a VPN for the SSH access?
We have three server instances, Nginx/PHP, PostgreSQL, and ELK stack. My idea is that the PHP server would allow public access for ports 22, 80, and 443, ELK server would have open port 5601 for ...
- 101
0
votes
1
answer
98
views
IPv6 vs IPv4 available subnets - enough or too less
I read a bit about IPv6 and found that usually you get assigned a /48 prefix address. Which gives you 16 bit for subnetting.
Reading further assuming that you use /64 subnets you would end up with ...
- 1
0
votes
1
answer
118
views
Cisco Catalyst 2960 Allow Management from Single IP Address
Our organization was recently required to use MFA for logging into our networking hardware. We're accomplishing this by using Royal Server and Royal TS, and limiting the source IP for SSH and web GUIs ...
- 13
0
votes
1
answer
383
views
Domain joined WAP in DMZ
To date, I've only ever used ADFS for claims aware applications.
I'm now looking at using it for some non-claims aware applications.
I've read that the WAP server must be domain joined for this so ...
- 1
0
votes
3
answers
1k
views
Do network acls block inter-subnet traffic as well?
I have VMs placed in different AZs on AWS. In order to be able to do this, you need a subnet in each AZ.
If I'm creating a network acl for the entire setup (ie to be associated with all subnets) do I ...
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votes
1
answer
306
views
AWS network-acl blocking nginx dns resolution
I'm trying to lock down ports on my subnets, and am having a problem with an nginx instance that I'm running on ECS.
Traffic comes into the system on :443 to an ELB, which routes some of it to an ...
- 113
2
votes
0
answers
80
views
Does an IP lockout policy prevent most public RDP attacks?
My company uses RemoteApp to provide a "cloud edition" of our desktop software.
The RDP port has been changed from default, and we run RDP Shield, which blocks the IP address after 5 failed ...
- 121
1
vote
0
answers
339
views
Is there a way to modify specific IP options through iptables?
In IP header there is a option 130 - specified in RFC 1108, it adds some security options for IP packet, like mandatory access control levels and categories. My task is to try to modify at least level ...
- 11
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votes
0
answers
28
views
Send command to another machine in a secure credential way
I have a question to ask you: I am creating a script to use with certbot for the renewal of certificates via DNS, everything works correctly on the same machine where BIND is also running (this ...
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1
answer
46
views
Network Mapped Drives sensitive information leakage when changing LAN networks on Windows
Assuming the following or similar setup of network drives/locations on a Windows 7+ system originally connected to a TrustedLAN:
TrustedLAN Gateway: 192.168.1.1 /24
TrustedLAN Windows System IP: 192....
- 103
0
votes
2
answers
224
views
Security implications of directly connecting a Windows PC to ISP via Network Adapter with Ethernet cable bypassing the Router
When diagnosing Internet connection issues (slow speed for example), an ISP technician may ask a user to connect their ISP-provided Ethernet cable directly to a device (typically a Windows PC) to run ...
- 103
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0
answers
22
views
GLOBAL lockout of ALL external incoming access attempts
I have stripped down my /etc/services file to bare minimum (according to my awareness of what is needed) for a Linux DESKTOP configuration accessing remote services and offering no services to remote ...
- 101
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0
answers
199
views
Location of authpriv.notice logs on Bitnami
I have a Bitnami server, Ubuntu Xenial, on AWS LightSail. I followed this tutorial to restrict SSH connections by country. This script ipfilter.sh filters IP addresses:
#!/bin/bash
# License: WTFPL
# ...
- 239
0
votes
1
answer
2k
views
Does GCP Cloud Armor support TCP load balancer? I am unable to add TCP load balancers as a Targets in Cloud Armor?
In the GCP cloud armor documentation, it is mentioned here, that it supports HTTP(S) and TCP load balancers to be configured. But I am unable to add TCP load balancer as a Target in Cloud Armor as it ...
0
votes
2
answers
3k
views
netsystemsresearch.com on my internal network
It first started happening with the local network enabled printer. It printed out that netsystemsresearch.com was doing a search of all public networks. I stopped that by disabling outside connections ...
- 101
-5
votes
1
answer
59
views
Which mobile VPN type, of IPSec, SSL/TLS, and SSH, would be better for travelling workers? [closed]
Not too sure on the specifics of each that would make one better for travelling.
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1
vote
0
answers
401
views
Do we need Fail2ban for VPN server?
we are using Ubuntu 20.04 LTS vps and running OpenVPN on it. We use certificate key to login to SSHD and the vps is not using any other program(eg. webserver etc).
Would you recommend installing and ...
- 11
0
votes
1
answer
363
views
AWS - VPC traffic being dropped - how to debug Network ACL and security group?
I have an AWS VPC with two subnets: Public and Private. I can access the internet (via a NAT Gateway) from the public subnet, but not from the private subnet, and I can't work out what's wrong.
Both ...
- 121
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votes
1
answer
1k
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NACLs and NAT Gateways for public and private subnets
I have a VPC with 3 subnets:
Public (FE layer, inbound internet access only)
Protected (app layer, outbound internet access only)
Private (DB layer, no internet access at all)
The public subnet NACL ...
- 121
0
votes
1
answer
274
views
AWS: VPN between VPC and an external resource with IKEv2 and ESP
I need to set up a VPN tunnel between the VPC in AWS and an external server with content that I want to access securely. The idea is to use the Site-to-site VPN Connection with Virtual Private Gateway ...
- 103
2
votes
1
answer
646
views
Apartment-wide single SSID / multiple password Wi-Fi network security concerns?
My apartment building is changing internet providers, and the new provider plans to install a network that will have a single SSID for the entire building. Each tenant will be given a unique password ...
- 121
0
votes
1
answer
41
views
Would proxying ssh be insecure
If I would use something for remote port forwarding like ngrok, or Serveo:
ssh -R 80:localhost:22 serveo.net
Would this pose a treat to my security since there is a man in the middle?
How would I ...
1
vote
0
answers
208
views
Install SMBv1 client on win10 without admin or compromising security? [closed]
This relates to Sending files from win10 to SMBv1 server? but it is broader. Feel free to edit/move/remove.
Windows 10 update 1803 removes all functionality of SMBv1 unless explicitly set so by admin,...
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votes
2
answers
2k
views
Security Considerations of AWS Private Subnet vs Private Security Group
AWS Virtual Private Cloud allows several ways of restricting access to devices on the VPC network from the Internet.
1) Place devices into a private subnet (no Internet Gateway). Each device can ...
- 183
0
votes
0
answers
71
views
Get information about MAC address
My router (FritzBox 7330) shows tons of errors about a device that continuously try to connect to my network:
23.12.19 10:17:07 Registrazione del dispositivo wireless fallita: chiave wireless ...
- 145
1
vote
1
answer
315
views
Can user credentials from HTTP session be seen through Wireshark? [duplicate]
Can we get that info the same way we do for FTP since HTTP is a plain text protocol?
- 21
0
votes
2
answers
1k
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Prevent Unjoined-to-domain computers from connecting to my network
How to prevent any computer that is not joined to the domain from requesting any service from my network? Considering that the computer is on another network.
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Related Tags
security × 14
networking × 7
ssh × 5
vpn × 5
firewall × 4
linux-networking × 4
network-share × 4
windows × 4
iptables × 3
linux × 3
amazon-vpc × 3
nftables × 3
router × 3
domain × 2
active-directory × 2
nginx × 2
subnet × 2
tcp × 2
web-server × 2
wifi × 2
wireguard × 2
more related tags
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