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linux:openvpn:issues [2025/08/12 08:41] – niziaklinux:openvpn:issues [2025/08/12 09:43] (current) – niziak
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 ====== Issues ====== ====== Issues ======
 +
 +====== IP packet with unknown IP version=15 seen ======
 +
 +  It's a common error happening when there's a difference in compression configuration between the server and the client.
 +
 +''comp-lzo'' disabled on server but enabled on client side.
 +
 +====== dco_parse_peer_multi: cannot store DCO stats for peer 4 ======
 +
 +
 +====== Note: NOT using '--topology subnet' disables data channel offload ======
 +
 +After server add topology:
 +
 +<file conf conf>
 +server 10.1.2.0 255.255.255.0
 +topology subnet
 +</file>
  
 ====== OpenSSL hardware crypto engine functionality is not available ====== ====== OpenSSL hardware crypto engine functionality is not available ======
Line 5: Line 23:
 OpenVPN server running in Proxmox KVM VM.  OpenVPN server running in Proxmox KVM VM. 
  
 +  If you want to use KVM, you need to set your CPU type to at least to Intel Westmere or to host.
 +  
 +Westmere formerly Nehalem-C (Core i 1 gen)
 +
 +"x86-64-v2-AES": 
 + 
 +  * i5-3470S = IvyBridge (3rd gen)
 +  * i7-3770K = IvyBridge (3rd gen)
 +  * E5-2650 v2 = Ivy Bridge EP (3rd gen)
  
 ====== ca md too weak ====== ====== ca md too weak ======