[英]Unable to NAT IP with Iptables and Strongswan in AWS
我剛剛配置了 Strongswan,可以在 AWS EC2 實例上成功啟動 VPN 隧道,但我遇到了流量問題,因為我們需要對我的 EC2 實例的私有 IP 地址進行 NAT,以便所有通過 VPN 的流量都來自具體的 IP。
但是目前,如果我 ping [DESTINATION_IP] 地址,我的流量仍然來自我的私人 IP。我在 iptables 中嘗試了幾個 PREROUTING 和 POSTROUTING 規則,但似乎沒有任何效果。 誰能解釋可能是什么問題?
在 AWS 中禁用源/目標檢查。
strongswan statusall
Listening IP addresses:
[PRIVATE_IP]
Connections:
vpn: %any...[VPN_FIREWALL_IP] IKEv2, dpddelay=10s
vpn: local: [[ELASTIC_PUBLIC_IP]] uses pre-shared key authentication
vpn: remote: [[VPN_FIREWALL_IP]] uses pre-shared key authentication
vpn: child: 0.0.0.0/0 === [DESTINATION_IP]/32 TUNNEL, dpdaction=restart
Security Associations (1 up, 0 connecting):
vpn[1]: ESTABLISHED 5 seconds ago, [PRIVATE_IP][[ELASTIC_PUBLIC_IP]]...[VPN_FIREWALL_IP][[VPN_FIREWALL_IP]]
vpn[1]: IKEv2 SPIs: 6055db442ef8607c_i* 3d2ec0bb945e9a2c_r, pre-shared key reauthentication in 7 hours
vpn[1]: IKE proposal: AES_CBC_128/HMAC_SHA2_256_128/PRF_HMAC_SHA1/MODP_2048
vpn{1}: INSTALLED, TUNNEL, reqid 1, ESP in UDP SPIs: ca9d2ca0_i df70a539_o
vpn{1}: AES_CBC_128/HMAC_SHA1_96, 0 bytes_i, 0 bytes_o, rekeying in 46 minutes
vpn{1}: [NAT_SOURCE_IP]/31 === [DESTINATION_IP]/32
ipsec配置文件
config setup
charondebug="all"
uniqueids=no
conn %default
ikelifetime=28800s
keyexchange=ikev2
keylife=3600s
keyingtries=%forever
mobike=no
conn vpn
authby=psk
auto=start
dpddelay=10s
dpdtimeout=30s
dpdaction=restart
ike=aes128-sha256-prfsha1-modp2048!
esp=aes128-sha256-modp2048,aes128-sha1-modp2048!
left=%defaultroute
leftid=[ELASTIC_PUBLIC_IP]
leftsubnet=0.0.0.0/0
leftfirewall=yes
rightsubnet=[DESTINATION_IP]/32
right=[VPN_FIREWALL_IP]
rightid=[VPN_FIREWALL_IP]
type=tunnel
mark=100
iptables-保存
*nat
:PREROUTING ACCEPT [9728:543855]
:INPUT ACCEPT [7882:388791]
:OUTPUT ACCEPT [20219:1527154]
:POSTROUTING ACCEPT [20725:1569658]
COMMIT
*filter
:INPUT ACCEPT [142:30437]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [188:34735]
-A FORWARD -s [DESTINATION_IP]/32 -d [NAT_SOURCE_IP]/31 -i eth0 -m policy --dir in --pol ipsec --reqid 1 --proto esp -j ACCEPT
-A FORWARD -s [NAT_SOURCE_IP]/31 -d [DESTINATION_IP]/32 -o eth0 -m policy --dir out --pol ipsec --reqid 1 --proto esp -j ACCEPT
COMMIT
如果我正確理解了您的問題,那么您是在詢問如何使用 Strongswan 在 EC2 實例上設置源 NAT。 我運行相同的設置,在我的例子中,遵循 [1] 中的 iptables 規則提供了請求的功能:
iptables -t nat -A POSTROUTING -s <NAT_SOURCE_IP>/24 -o eth0 -m policy --dir out --pol ipsec -j ACCEPT
iptables -t nat -A POSTROUTING -s <NAT_SOURCE_IP>/24 -o eth0 -j MASQUERADE
[1] https://wiki.strongswan.org/projects/strongswan/wiki/ForwardingAndSplitTunneling
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