iptables (sysctl.conf)

NAT como padrão

Categoria: Networking

Software: iptables

[ Hits: 15.118 ]

Por: Jorge Alberto Corso


Este arquivo existe nas distros RedHat, deve ficar em /etc, e é uma forma de automatizar o mascaramento (NAT) sem ter que acrescentar nos scripts uma linha como 'echo 1 > /proc/sys/net/ipv4/ip_forward'.


# If active, enablles IPv4 packet forwarding
# o parâmetro abaixo deve ser ativado (1) para o mascaramento ser automatico
net.ipv4.ip_forward = 1

# If active, enables source route verification
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

# If active, enables the magic-sysrq key (alt+sysRq)
kernel.sysrq = 1

# If active, logs 'impossible' source addresses
net.ipv4.conf.all.log_martians = 1

# If active, rewrites outgoing IP packets if address changes
net.ipv4.ip_dynaddr = 0

# If active, ignores ICMP with broadcast destination
net.ipv4.icmp_echo_ignore_broadcasts = 1

# If active, accepts IP packets with source route info
net.ipv4.conf.all.accept_source_route = 0

# If active, ignores all ICMP requests
net.ipv4.icmp_echo_ignore_all = 0

# Mask made of ICMP types for which rates are being limited.
# Default: 6168
# Note: 6168 = 0x1818 = 1<<ICMP_DEST_UNREACH + 1<<ICMP_SOURCE_QUENCH +
#       1<<ICMP_TIME_EXCEEDED + 1<<ICMP_PARAMETERPROB, which means
#       dest unreachable (3), source quench (4), time exceeded (11)
#       and parameter problem (12) ICMP packets are rate limited
#       (check values in icmp.h)
# 6169 also limits echo_reply's
net.ipv4.icmp_ratemask = 6169

# ICMP ratelimit, in jiffies
# 1 jiffie = 1/100s in Intel, 1/1024s in Alpha
net.ipv4.icmp_ratelimit = 100

# If active, uses TCP SYN cookies
net.ipv4.tcp_syncookies = 1

# If active, accepts ICMP redirect orders
net.ipv4.conf.all.accept_redirects = 0

# rtc setup (you have to load rtc kernel module in /etc/rc.modules
# for this work properly.)
#dev.rtc.max-user-freq = 1024
  


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