pptp iptables snat记录

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本文详细介绍了iptables的nat表和filter表的具体配置，包括源地址转换(SNAT)规则及对特定协议(如GRE)的支持，并启用了IPv4转发，确保了网络流量的正确路由和处理。

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iptables

# Generated by iptables-save v1.4.7 on Fri May 12 18:26:39 2017
*nat
:PREROUTING ACCEPT [305:30920]
:POSTROUTING ACCEPT [5:412]
:OUTPUT ACCEPT [5:412]
-A POSTROUTING -s 192.168.2.0/24 -o eth1 -j SNAT --to-source 103.249.*.*
-A POSTROUTING -p gre -j SNAT --to-source 103.249.*.*
COMMIT
# Completed on Fri May 12 18:26:39 2017
# Generated by iptables-save v1.4.7 on Fri May 12 18:26:39 2017
*filter
:INPUT ACCEPT [627:79020]
:FORWARD ACCEPT [844:77525]
:OUTPUT ACCEPT [328:56275]
-A INPUT -p gre -j ACCEPT
-A OUTPUT -p gre -j ACCEPT
COMMIT
# Completed on Fri May 12 18:26:39 2017

kernel模块

modprobe nf_nat_pptp
modprobe nf_conntrack_pptp
modprobe nf_conntrack_proto_gre
modprobe nf_nat_proto_gre
modprobe nf_nat
modprobe nf_conntrack
modprobe ppdev
modprobe parport

systctl

net.ipv4.ip_forward = 1