How to set up one OpenVPN client as gateway for others?

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I try to set up my OpenVPN network and now I have:



  • 10.9.1.1 - server (manjaro linux)

  • 10.9.1.8 - client (ubuntu 16.04)

  • 10.9.1.12 - client

I want to set 10.9.1.8 as gateway for 10.9.1.12 client.



How to achieve that?



What I have unfortunnately done:



  1. enabled net.ipv4.ip_forward both on 10.9.1.1 and 10.9.1.8

  2. set up iptables on 10.9.1.1 with:



 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *mangle
 :PREROUTING ACCEPT [110603:60535351]
 :INPUT ACCEPT [100907:58448049]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [95123:49910955]
 :POSTROUTING ACCEPT [95825:49957792]
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *nat
 :PREROUTING ACCEPT [10463:2162687]
 :INPUT ACCEPT [1080:96754]
 :OUTPUT ACCEPT [2086:138622]
 :POSTROUTING ACCEPT [2088:139166]
 -A POSTROUTING -m mark --mark 0xc8 -j SNAT --to-source 10.9.1.1
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *filter
 :INPUT ACCEPT [108740:59988331]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [102931:52099400]
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018



  1. Set up routes and rules on 10.9.1.1


# ip route show table ovpn
default via 10.9.1.8 dev tun0

# ip rule show
0: from all lookup local
32764: from all fwmark 0xc8 lookup ovpn
32765: from all fwmark 0xc8 lookup ovpn
32766: from all lookup main
32767: from all lookup default


  1. Masquerading on 10.9.1.8


*nat
-A POSTROUTING -s 10.9.1.0/24 -o eth0 -j MASQUERADE


But when I connect 10.9.1.12 and make ping 8.8.8.8 I have this into tcp_dump:




00:01:58.643578 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2073, seq 1, length 64
00:02:00.680303 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2074, seq 1, length 64
00:02:00.680377 Out 10.9.1.1 > 10.9.1.12: ICMP time exceeded in-transit, length 92
00:02:00.695581 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:00.695621 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:02.727047 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:02.727106 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:04.764913 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:04.764969 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:06.798658 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:06.798719 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:08.820212 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:08.820269 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:10.844821 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64
00:02:10.844878 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64


and 100% lost packages.




linux networking routing openvpn gateway




share|improve this question















  • 1




    Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
    – roaima
    Apr 28 at 7:34










  • @roaima I haven't parse you comment. Could you explain it?
    – bvn13
    Apr 28 at 8:04






  • 1




    You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
    – roaima
    Apr 28 at 8:42










  • @roaima could you give me an example of networks described by you?
    – bvn13
    Apr 28 at 11:09














up vote
0
down vote

favorite
1












I try to set up my OpenVPN network and now I have:



  • 10.9.1.1 - server (manjaro linux)

  • 10.9.1.8 - client (ubuntu 16.04)

  • 10.9.1.12 - client

I want to set 10.9.1.8 as gateway for 10.9.1.12 client.



How to achieve that?



What I have unfortunnately done:



  1. enabled net.ipv4.ip_forward both on 10.9.1.1 and 10.9.1.8

  2. set up iptables on 10.9.1.1 with:



 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *mangle
 :PREROUTING ACCEPT [110603:60535351]
 :INPUT ACCEPT [100907:58448049]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [95123:49910955]
 :POSTROUTING ACCEPT [95825:49957792]
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *nat
 :PREROUTING ACCEPT [10463:2162687]
 :INPUT ACCEPT [1080:96754]
 :OUTPUT ACCEPT [2086:138622]
 :POSTROUTING ACCEPT [2088:139166]
 -A POSTROUTING -m mark --mark 0xc8 -j SNAT --to-source 10.9.1.1
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *filter
 :INPUT ACCEPT [108740:59988331]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [102931:52099400]
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018



  1. Set up routes and rules on 10.9.1.1


# ip route show table ovpn
default via 10.9.1.8 dev tun0

# ip rule show
0: from all lookup local
32764: from all fwmark 0xc8 lookup ovpn
32765: from all fwmark 0xc8 lookup ovpn
32766: from all lookup main
32767: from all lookup default


  1. Masquerading on 10.9.1.8


*nat
-A POSTROUTING -s 10.9.1.0/24 -o eth0 -j MASQUERADE


But when I connect 10.9.1.12 and make ping 8.8.8.8 I have this into tcp_dump:




00:01:58.643578 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2073, seq 1, length 64
00:02:00.680303 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2074, seq 1, length 64
00:02:00.680377 Out 10.9.1.1 > 10.9.1.12: ICMP time exceeded in-transit, length 92
00:02:00.695581 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:00.695621 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:02.727047 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:02.727106 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:04.764913 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:04.764969 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:06.798658 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:06.798719 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:08.820212 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:08.820269 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:10.844821 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64
00:02:10.844878 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64


and 100% lost packages.




linux networking routing openvpn gateway




share|improve this question















  • 1




    Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
    – roaima
    Apr 28 at 7:34










  • @roaima I haven't parse you comment. Could you explain it?
    – bvn13
    Apr 28 at 8:04






  • 1




    You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
    – roaima
    Apr 28 at 8:42










  • @roaima could you give me an example of networks described by you?
    – bvn13
    Apr 28 at 11:09












up vote
0
down vote

favorite
1









up vote
0
down vote

favorite
1






1





I try to set up my OpenVPN network and now I have:



  • 10.9.1.1 - server (manjaro linux)

  • 10.9.1.8 - client (ubuntu 16.04)

  • 10.9.1.12 - client

I want to set 10.9.1.8 as gateway for 10.9.1.12 client.



How to achieve that?



What I have unfortunnately done:



  1. enabled net.ipv4.ip_forward both on 10.9.1.1 and 10.9.1.8

  2. set up iptables on 10.9.1.1 with:



 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *mangle
 :PREROUTING ACCEPT [110603:60535351]
 :INPUT ACCEPT [100907:58448049]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [95123:49910955]
 :POSTROUTING ACCEPT [95825:49957792]
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *nat
 :PREROUTING ACCEPT [10463:2162687]
 :INPUT ACCEPT [1080:96754]
 :OUTPUT ACCEPT [2086:138622]
 :POSTROUTING ACCEPT [2088:139166]
 -A POSTROUTING -m mark --mark 0xc8 -j SNAT --to-source 10.9.1.1
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *filter
 :INPUT ACCEPT [108740:59988331]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [102931:52099400]
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018



  1. Set up routes and rules on 10.9.1.1


# ip route show table ovpn
default via 10.9.1.8 dev tun0

# ip rule show
0: from all lookup local
32764: from all fwmark 0xc8 lookup ovpn
32765: from all fwmark 0xc8 lookup ovpn
32766: from all lookup main
32767: from all lookup default


  1. Masquerading on 10.9.1.8


*nat
-A POSTROUTING -s 10.9.1.0/24 -o eth0 -j MASQUERADE


But when I connect 10.9.1.12 and make ping 8.8.8.8 I have this into tcp_dump:




00:01:58.643578 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2073, seq 1, length 64
00:02:00.680303 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2074, seq 1, length 64
00:02:00.680377 Out 10.9.1.1 > 10.9.1.12: ICMP time exceeded in-transit, length 92
00:02:00.695581 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:00.695621 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:02.727047 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:02.727106 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:04.764913 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:04.764969 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:06.798658 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:06.798719 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:08.820212 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:08.820269 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:10.844821 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64
00:02:10.844878 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64


and 100% lost packages.




linux networking routing openvpn gateway




share|improve this question











I try to set up my OpenVPN network and now I have:



  • 10.9.1.1 - server (manjaro linux)

  • 10.9.1.8 - client (ubuntu 16.04)

  • 10.9.1.12 - client

I want to set 10.9.1.8 as gateway for 10.9.1.12 client.



How to achieve that?



What I have unfortunnately done:



  1. enabled net.ipv4.ip_forward both on 10.9.1.1 and 10.9.1.8

  2. set up iptables on 10.9.1.1 with:



 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *mangle
 :PREROUTING ACCEPT [110603:60535351]
 :INPUT ACCEPT [100907:58448049]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [95123:49910955]
 :POSTROUTING ACCEPT [95825:49957792]
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 -A PREROUTING -s 10.9.1.12/32 -i tun0 -j MARK --set-xmark 0xc8/0xffffffff
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *nat
 :PREROUTING ACCEPT [10463:2162687]
 :INPUT ACCEPT [1080:96754]
 :OUTPUT ACCEPT [2086:138622]
 :POSTROUTING ACCEPT [2088:139166]
 -A POSTROUTING -m mark --mark 0xc8 -j SNAT --to-source 10.9.1.1
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018
 # Generated by iptables-save v1.6.2 on Fri Apr 27 23:50:30 2018
 *filter
 :INPUT ACCEPT [108740:59988331]
 :FORWARD ACCEPT [740:50674]
 :OUTPUT ACCEPT [102931:52099400]
 COMMIT
 # Completed on Fri Apr 27 23:50:30 2018



  1. Set up routes and rules on 10.9.1.1


# ip route show table ovpn
default via 10.9.1.8 dev tun0

# ip rule show
0: from all lookup local
32764: from all fwmark 0xc8 lookup ovpn
32765: from all fwmark 0xc8 lookup ovpn
32766: from all lookup main
32767: from all lookup default


  1. Masquerading on 10.9.1.8


*nat
-A POSTROUTING -s 10.9.1.0/24 -o eth0 -j MASQUERADE


But when I connect 10.9.1.12 and make ping 8.8.8.8 I have this into tcp_dump:




00:01:58.643578 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2073, seq 1, length 64
00:02:00.680303 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2074, seq 1, length 64
00:02:00.680377 Out 10.9.1.1 > 10.9.1.12: ICMP time exceeded in-transit, length 92
00:02:00.695581 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:00.695621 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2075, seq 1, length 64
00:02:02.727047 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:02.727106 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2076, seq 1, length 64
00:02:04.764913 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:04.764969 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2077, seq 1, length 64
00:02:06.798658 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:06.798719 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2078, seq 1, length 64
00:02:08.820212 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:08.820269 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2079, seq 1, length 64
00:02:10.844821 In 10.9.1.12 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64
00:02:10.844878 Out 10.9.1.1 > 8.8.8.8: ICMP echo request, id 2080, seq 1, length 64


and 100% lost packages.





linux networking routing openvpn gateway





share|improve this question










share|improve this question




share|improve this question









asked Apr 28 at 7:17









bvn13

11




11







  • 1




    Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
    – roaima
    Apr 28 at 7:34










  • @roaima I haven't parse you comment. Could you explain it?
    – bvn13
    Apr 28 at 8:04






  • 1




    You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
    – roaima
    Apr 28 at 8:42










  • @roaima could you give me an example of networks described by you?
    – bvn13
    Apr 28 at 11:09












  • 1




    Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
    – roaima
    Apr 28 at 7:34










  • @roaima I haven't parse you comment. Could you explain it?
    – bvn13
    Apr 28 at 8:04






  • 1




    You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
    – roaima
    Apr 28 at 8:42










  • @roaima could you give me an example of networks described by you?
    – bvn13
    Apr 28 at 11:09







1




1




Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
– roaima
Apr 28 at 7:34




Your network looks wrong. Your OpenVPN client and server would usually be on different networks. You then use a third network for OpenVPN to join them. This third network cannot be used elsewhere in your network. Your third machine should be on the same LAN network as the second but this cannot be the same as the OpenVPN network.
– roaima
Apr 28 at 7:34












@roaima I haven't parse you comment. Could you explain it?
– bvn13
Apr 28 at 8:04




@roaima I haven't parse you comment. Could you explain it?
– bvn13
Apr 28 at 8:04




1




1




You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
– roaima
Apr 28 at 8:42




You need three networks. (1) For the server (2) For the client LAN, which both client machines must be on (3) For OpenVPN between the server and its client. // You appear to be trying to use the same network 10.9.1 for everything and that cannot work.
– roaima
Apr 28 at 8:42












@roaima could you give me an example of networks described by you?
– bvn13
Apr 28 at 11:09




@roaima could you give me an example of networks described by you?
– bvn13
Apr 28 at 11:09















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How to check contact read email or not when send email to Individual?

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Clash Royale CLAN TAG #URR8PPP up vote 1 down vote favorite I'm using WordPress 4.9.8, CiviCRM to 5.5.1, I usually send email to contact by Search> Find contacts View contact details Action> Send email Send email ok, Contact received mail ok like picture But status only Email sent though contact read email or not. So, can CiviCRM can change status to Email read when contact read email? wordpress email share | improve this question asked Sep 26 at 0:12 ToanLuong 49 9 add a comment  |  up vote 1 down vote favorite I'm using WordPress 4.9.8, CiviCRM to 5.5.1, I usually send email to contact by Search> Find contacts View contact details Action> Send email Send email ok, Contact received mail ok like picture But status only Email sent though contact read email or not. So, can CiviCRM can change status to Email read when contact read email? wordpress email share | improve this questi...
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Displaying single band from multi-band raster using QGIS

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Clash Royale CLAN TAG #URR8PPP 1 How can I extract a single band from multi-band raster in QGIS? I have an remote sensed image which has 6 bands (including NDVI band), I want to display each band separately, but have no idea how to do. I have seen some questions similar here but none worked for me. The original image (has 6 bands) is: I want to display the band 6 which should be like this: But I tried gdal_translate, and couldn't get the correct result. What I have got is: qgis raster multi-band share | improve this question edited Mar 5 at 0:53 Summer asked Mar 4 at 6:42 Summer Summer 23 6 Is this any help gis.stackexchange.com/questions/220658/… ? if not gis.stackexchange.com/questions/62133/… might help. – Michael Stimson Mar 4 at 6:46 Thanks for answering but when I used gdal_translate, qgis showed that 'Error 4: Kayena.tif: No such file or directory". Would you know how to fi...
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How many registers does an x86_64 CPU actually have?

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Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite I am currently learning reverse engineering and am studying the flags register. I had in my mind that rflags was just another name for one of the 16 general purpose registers, for example rax or rbx . But it looks like rflags is actually an additional register. So that makes 17 registers in total... how many more could there be? I have spent at least an hour on this and found numerous different answers. The best answer so far is this, which says that there are 40 registers in total. 16 General Purpose Registers 2 Status Registers 6 Code Segment Registers 16 SSE Registers 8 FPU/MMX Registers But if I add that up, I get 48. Could anybody provide an official answer on how many registers an x86_64 CPU has (e.g. an Intel i7). Additionally, I have seen references to 'hardware' and 'architectural' registers. What are those registers and how many are there? register x86-64 share | improve this...
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