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| e4ff78 | Samuli Seppänen | 2025-02-27 13:12:06 | 1 | # Data Channel Offload: supported features |
| 2 | ||||
| 3 | This page aims at summarizing all data channel features and their support status in the DCO modules across the supported platforms.\\ |
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| 4 | New features may be added over time, therefore keep an eye on this page if interested. |
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| 6 | Please, also note that some features, like compression are considered to be legacy and expected to never be implemented in ovpn-dco. This is a design decision aimed at keeping ovpn-dco as simple as possible, while also taking the chance to drop those functionalities that are not consider useful anymore (or even harmful!). |
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| 8 | ## Supported features by platform |
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| 10 | This table is constantly work in progress, therefore expect changes over time. |
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| 12 | |**Feature**|**Windows**|**Linux**|**FreeBSD**|**Remark**| |
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| 13 | |-|-|-|-|-| |
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| 14 | |TUN mode (L3)| yes| yes| yes| | |
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| 15 | |TAP mode (L2)| no| no| no| not planned| |
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| 98159e | cron2 | 2025-05-28 12:25:01 | 16 | |Mode: client, P2MP/server| client, server | client, server| client, server| | |
| e4ff78 | Samuli Seppänen | 2025-02-27 13:12:06 | 17 | |UDP as transport| yes| yes| yes| | |
| 98159e | cron2 | 2025-05-28 12:25:01 | 18 | |TCP as transport| yes (not for server)| yes| no| | |
| e4ff78 | Samuli Seppänen | 2025-02-27 13:12:06 | 19 | |Ciphers| AES-GCM| AES-GCM| AES-GCM| | |
| 20 | | | ChaCha20-Poly1305 (Win11 only)| ChaCha20-Poly1305| ChaCha20-Poly1305| | |
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| 6c0bc5 | cron2 | 2025-07-19 09:02:31 | 21 | |AEAD Epoch Keys| no | no | no | desirable | |
| d25374 | cron2 | 2025-07-19 09:01:17 | 22 | |Internal routes handling ```--iroute```| yes| standard system routes| yes (do not use identical route/iroute masks)| | |
| e4ff78 | Samuli Seppänen | 2025-02-27 13:12:06 | 23 | |Outside fragmentation (inside MTU 1500)| yes| handled by kernel| yes (to be tested)| | |
| 24 | |OpenVPN fragmentation (```--fragment```)| no| no| no| not planned| |
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| 25 | |MSS mangling ```--mssfix```| yes| no (can be done via nft)| no (can be done via pf)| desirable| |
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| 26 | |Compression| no| no| no| not planned| |
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| 27 | |OCC packets in data channel| ?| no| ?| required for mtu-test (other use cases?) | |
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| 28 | |RPF check (server only)| n/a| yes| ?| |
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| 29 | |Topology other than subnet ```--topology net30\|p2p```| no| no| no| not planned| |
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| d25374 | cron2 | 2025-07-19 09:01:17 | 30 | |--float on TLS server|yes |yes|no|2.7_alpha3 needed to receive kernel notifications| |
| 98159e | cron2 | 2025-05-28 12:25:01 | 31 | |--float on TLS client|no|no|no|| |