Firewall 1: Review the following firewall warning:
Aug 27 16:52:43.385439 unknown kernel: [UFW BLOCK] IN=
OUT=eth0 SRC=10.0.2.15 DST=1.1.1.1 LEN=95 TOS=0x00 PREC=0x00
TTL=64 ID=17221 DF PROTO=UDP SPT=46330 DPT=53 LEN=75
Complete the following UFW command to whitelist this packet and allow DNS requests
to Cloudflare. Be as specific as possible (use "any" sparingly, if at all).
ufw allow out on eth0 from to proto port

Question

19-12-2022
Computers and Technology

Answered

Firewall 1: Review the following firewall warning:
Aug 27 16:52:43.385439 unknown kernel: [UFW BLOCK] IN=
OUT=eth0 SRC=10.0.2.15 DST=1.1.1.1 LEN=95 TOS=0x00 PREC=0x00
TTL=64 ID=17221 DF PROTO=UDP SPT=46330 DPT=53 LEN=75
Complete the following UFW command to whitelist this packet and allow DNS requests
to Cloudflare. Be as specific as possible (use "any" sparingly, if at all).
ufw allow out on eth0 from to proto port

Answer :

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tutorconsortium618 tutorconsortium618 · Answer 1 · 2022-12-22T14:21:00-05:00

UFW (Uncomplicated Firewall) is a frontend for managing the iptables firewall on Linux systems. It is designed to be easy to use and configure, and provides a simple interface for managing firewall rules.

How to whitelist the packet?

To whitelist the packet described in the firewall warning and allow DNS requests to Cloudflare, the UFW command would be:

ufw allow out on eth0 from 10.0.2.15 to 1.1.1.1 proto udp port 53

This command specifies the outgoing interface (eth0), the source IP address (10.0.2.15), the destination IP address (1.1.1.1), the protocol (UDP), and the destination port (53), which is the standard port for DNS traffic.

By specifying these details, the command allows outgoing DNS requests from the source IP address to the destination IP address using the specified protocol and port. This will allow the packets described in the firewall warning to pass through the firewall and reach Cloudflare.

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