philtreF opened a new issue, #10655:
URL: https://github.com/apache/cloudstack/issues/10655

   ### The required feature described as a wish
   
   Dear cloudstack community, 
   
   I was surprised to see that the current implementation of client to site VPN 
does not enable to open multiple client to site VPN when computers share the 
same public IPs. 
   
   I read #8566 and found that another people have the same experience. 
   Charon is aware of this NAT client situation as per my logs : 
   
   `
   Apr  2 20:27:35 r-4188-VM charon: 06[ENC] parsed ID_PROT request 0 [ KE No 
NAT-D NAT-D ]
   Apr  2 20:27:35 r-4188-VM charon: 06[IKE] **remote host is behind NAT**
   Apr  2 20:27:35 r-4188-VM charon: 06[ENC] generating ID_PROT response 0 [ KE 
No NAT-D NAT-D ]
   Apr  2 20:27:35 r-4188-VM charon: 06[NET] sending packet: from 
182.234.27.275[500] to 36.35.10.124[57049] (372 bytes)
   Apr  2 20:27:35 r-4188-VM charon: 12[NET] received packet: from 
36.35.10.124[55814] to 182.234.27.275[4500] (76 bytes)
   Apr  2 20:27:35 r-4188-VM charon: 12[ENC] parsed ID_PROT request 0 [ ID HASH 
]
   Apr  2 20:27:35 r-4188-VM charon: 12[CFG] looking for pre-shared key peer 
configs matching 182.234.27.275...36.35.10.124[192.168.1.93]
   Apr  2 20:27:35 r-4188-VM charon: 12[CFG] selected peer config "L2TP-PSK"
   Apr  2 20:27:35 r-4188-VM charon: 12[IKE] IKE_SA L2TP-PSK[150] established 
between 182.234.27.275[182.234.27.275]...36.35.10.124[**192.168.1.93**]
   Apr  2 20:27:35 r-4188-VM charon: 12[ENC] generating ID_PROT response 0 [ ID 
HASH ]
   [...]
   Apr  2 20:27:35 r-4188-VM ipsec[6798]: 15[CFG] looking for pre-shared key 
peer configs matching 182.234.27.275...36.35.10.124[192.168.1.14]
   Apr  2 20:27:35 r-4188-VM ipsec[6798]: 15[CFG] selected peer config 
"L2TP-PSK"
   Apr  2 20:27:35 r-4188-VM ipsec[6798]: 15[IKE] IKE_SA L2TP-PSK[149] 
established between 
182.234.27.275[182.234.27.275]...36.35.10.124[**192.168.1.14**]
   `
   
   But like described in #8566 only one client is able to login at a time. The 
second one disconnect the first one...
   
   https://docs.strongswan.org/docs/latest/plugins/connmark.html
   Strongswan's input is to compile with --enable-connmark flag. 
   
   I am researching to fix this myself and then to make a PR to make this 
available for the community. Are the system vm images closed source or can I 
find a repo somewhere to improve this behavior?
   
   Fred
   
   


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