[strongSwan] Cannot pass the traffic through the established tunnel.

[Sujoy]

Thanks Noel for the reply, There are two issue-
1) I cannot pass the normal traffic through the VPN tunnel and 2) I want 
to redirect the all http traffic through the established tunnel.
Following is the current iptables status.


@cloud:~$ sudo iptables-save

[sudo] password for kencloud_mlx:
# Generated by iptables-save v1.6.0 on Fri Apr  6 15:36:00 2018
*filter
:INPUT ACCEPT [2373595:1217217340]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [2358742:1592362700]
-A INPUT -p tcp -m tcp --dport 5432 -j ACCEPT
COMMIT
# Completed on Fri Apr  6 15:36:00 2018
# Generated by iptables-save v1.6.0 on Fri Apr  6 15:36:00 2018
*nat
:PREROUTING ACCEPT [343961:24571900]
:INPUT ACCEPT [53423:7217944]
:OUTPUT ACCEPT [12732:772316]
:POSTROUTING ACCEPT [12732:772316]
-A PREROUTING -p tcp -m tcp --dport 26 -j DNAT --to-destination 
172.25.12.42:80
COMMIT
# Completed on Fri Apr  6 15:36:00 2018



Thanks
Sujoy
On Thursday 05 April 2018 10:15 PM, Noel Kuntze wrote:
> Hello Sujoy,
>
> Do you mean to block all traffic that uses TCP port 80 (0.0.0.0/0[tcp/80]), but the traffic that is protected in an established tunnel?
> Or do you mean to block everything but what is protected?
>
> Kind regards
>
> Noel
>
> On 04.04.2018 10:58, Sujoy wrote:
>> Hi list members,
>>
>>   I am facing one issue with Strongswan for quite long time. I want to block all the traffic(http) and pass only the traffic of connected network. But after so many try, still I cannot do so. Bellow is the configuration status of the Server which is having multiple connection. It will be a big help if someone can provide any solution to this. Thanks for the support provide till now from the members.
>>
>>
>>
>> root at cloud:~# ipsec statusall
>> Status of IKE charon daemon (strongSwan 5.6.2, Linux 4.4.0-116-generic, x86_64):
>>    uptime: 19 hours, since Apr 03 18:02:13 2018
>>    malloc: sbrk 2703360, mmap 0, used 570192, free 2133168
>>    worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, scheduled: 12
>>    loaded plugins: charon aes des rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem openssl fips-prf gmp curve25519 xcbc cmac hmac curl attr kernel-netlink resolve socket-default stroke vici updown xauth-generic counters
>> Listening IP addresses:
>>    172.25.12.42
>> Connections:
>>        tunnel:  %any...%any  IKEv2, dpddelay=30s
>>        tunnel:   local:  uses pre-shared key authentication
>>        tunnel:   remote: uses pre-shared key authentication
>>        tunnel:   child:  0.0.0.0/0 === 0.0.0.0/0 TUNNEL, dpdaction=clear
>> Security Associations (2 up, 0 connecting):
>>        tunnel[6]: ESTABLISHED 66 minutes ago, 172.25.12.42[X.X.X.X]...223.227.10.138[192.168.1.100]
>>        tunnel[6]: IKEv2 SPIs: 1e596ccc27d7939a_i c459f660671c3952_r*, pre-shared key reauthentication in 101 minutes
>>        tunnel[6]: IKE proposal: AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
>>        tunnel{16}:  INSTALLED, TUNNEL, reqid 3, ESP in UDP SPIs: cc167350_i c722bb0f_o
>>        tunnel{16}:  AES_CBC_256/HMAC_SHA1_96, 0 bytes_i, 0 bytes_o, rekeying in 35 minutes
>>        tunnel{16}:   X.X.X.X/32 === 192.168.10.1/32
>>        tunnel[5]: ESTABLISHED 76 minutes ago, 172.25.12.42[X.X.X.X]...27.59.17.206[192.168.2.100]
>>        tunnel[5]: IKEv2 SPIs: 6bac8f644b19cf85_i 07c5f9254cda6720_r*, pre-shared key reauthentication in 90 minutes
>>        tunnel[5]: IKE proposal: AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
>>        tunnel{17}:  INSTALLED, TUNNEL, reqid 3, ESP in UDP SPIs: c3015f13_i ce6ea6b8_o
>>        tunnel{17}:  AES_CBC_256/HMAC_SHA1_96, 0 bytes_i, 0 bytes_o, rekeying in 36 minutes
>>        tunnel{17}:   X.X.X.X/32 === 192.168.10.1/32