vpn has no internet after upgrading to 18.04











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Resently,i upgrade my ubuntu 16.04 server to 18.04



but after upgrading ,my (Cisco anyconnect,pptp) vpn servers have no internet access...



Can anyone help me?






18.04 internet vpn iptables pptp







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    up vote
    0
    down vote

    favorite
    1












    Resently,i upgrade my ubuntu 16.04 server to 18.04



    but after upgrading ,my (Cisco anyconnect,pptp) vpn servers have no internet access...



    Can anyone help me?






    18.04 internet vpn iptables pptp







    share|improve this question


























      up vote
      0
      down vote

      favorite
      1









      up vote
      0
      down vote

      favorite
      1






      1





      Resently,i upgrade my ubuntu 16.04 server to 18.04



      but after upgrading ,my (Cisco anyconnect,pptp) vpn servers have no internet access...



      Can anyone help me?






      18.04 internet vpn iptables pptp







      share|improve this question















      Resently,i upgrade my ubuntu 16.04 server to 18.04



      but after upgrading ,my (Cisco anyconnect,pptp) vpn servers have no internet access...



      Can anyone help me?






      18.04 internet vpn iptables pptp




      18.04 internet vpn iptables pptp






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 20 at 11:43

























      asked Nov 19 at 21:13









      ahooyee

      140128




      140128






















          1 Answer
          1






          active

          oldest

          votes

















          up vote
          0
          down vote



          accepted










          I solved the problem by adding following 2 iptables rules to my ubuntu server



           iptables -P FORWARD ACCEPT
          
 iptables -P OUTPUT ACCEPT


          my exisisting iptables rules (related to pptp and ocsrv) before above changes:



          iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
          
iptables -I INPUT -p gre -j ACCEPT
          
iptables -t nat -I POSTROUTING -o ens32 -j MASQUERADE
          
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -s 182.18.0.0/24 -j TCPMSS  --clamp-mss-to-pmtu
          
iptables -t nat -A POSTROUTING -o ens32 -j MASQUERADE
          
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
          
iptables -I INPUT -p udp --dport 443 -j ACCEPT





          share|improve this answer





















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            1 Answer
            1






            active

            oldest

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            active

            oldest

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            active

            oldest

            votes








            up vote
            0
            down vote



            accepted










            I solved the problem by adding following 2 iptables rules to my ubuntu server



             iptables -P FORWARD ACCEPT
            
 iptables -P OUTPUT ACCEPT


            my exisisting iptables rules (related to pptp and ocsrv) before above changes:



            iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
            
iptables -I INPUT -p gre -j ACCEPT
            
iptables -t nat -I POSTROUTING -o ens32 -j MASQUERADE
            
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -s 182.18.0.0/24 -j TCPMSS  --clamp-mss-to-pmtu
            
iptables -t nat -A POSTROUTING -o ens32 -j MASQUERADE
            
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
            
iptables -I INPUT -p udp --dport 443 -j ACCEPT





            share|improve this answer

























              up vote
              0
              down vote



              accepted










              I solved the problem by adding following 2 iptables rules to my ubuntu server



               iptables -P FORWARD ACCEPT
              
 iptables -P OUTPUT ACCEPT


              my exisisting iptables rules (related to pptp and ocsrv) before above changes:



              iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
              
iptables -I INPUT -p gre -j ACCEPT
              
iptables -t nat -I POSTROUTING -o ens32 -j MASQUERADE
              
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -s 182.18.0.0/24 -j TCPMSS  --clamp-mss-to-pmtu
              
iptables -t nat -A POSTROUTING -o ens32 -j MASQUERADE
              
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
              
iptables -I INPUT -p udp --dport 443 -j ACCEPT





              share|improve this answer























                up vote
                0
                down vote



                accepted







                up vote
                0
                down vote



                accepted






                I solved the problem by adding following 2 iptables rules to my ubuntu server



                 iptables -P FORWARD ACCEPT
                
 iptables -P OUTPUT ACCEPT


                my exisisting iptables rules (related to pptp and ocsrv) before above changes:



                iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
                
iptables -I INPUT -p gre -j ACCEPT
                
iptables -t nat -I POSTROUTING -o ens32 -j MASQUERADE
                
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -s 182.18.0.0/24 -j TCPMSS  --clamp-mss-to-pmtu
                
iptables -t nat -A POSTROUTING -o ens32 -j MASQUERADE
                
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
                
iptables -I INPUT -p udp --dport 443 -j ACCEPT





                share|improve this answer












                I solved the problem by adding following 2 iptables rules to my ubuntu server



                 iptables -P FORWARD ACCEPT
                
 iptables -P OUTPUT ACCEPT


                my exisisting iptables rules (related to pptp and ocsrv) before above changes:



                iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
                
iptables -I INPUT -p gre -j ACCEPT
                
iptables -t nat -I POSTROUTING -o ens32 -j MASQUERADE
                
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -s 182.18.0.0/24 -j TCPMSS  --clamp-mss-to-pmtu
                
iptables -t nat -A POSTROUTING -o ens32 -j MASQUERADE
                
iptables -I INPUT -p tcp --dport 443 -j ACCEPT
                
iptables -I INPUT -p udp --dport 443 -j ACCEPT






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 20 at 11:42









                ahooyee

                140128




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