exercise2c « exercise2 « netsec-assignment5-S4498062 - NWI-IBC022-Network-Security - Files related to NWI-IBC022 Network Security, autumn 2015, Radboud University Nijmegen.

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We could reject all packets with a spoofed IP address by only accepting packets
where the source address is in our subnet:

# iptables -A OUTPUT -j DROP
# iptables -A OUTPUT -s 203.0.113.0/24 ACCEPT