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with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1ikqrR-000Bls-0R for wireguard@lists.zx2c4.com; Fri, 27 Dec 2019 15:45:05 +0100 Subject: Re: bad udp cksum messages in tcpdump for wg0 To: wireguard@lists.zx2c4.com References: <49-5dfcd100-9-66d44b80@213097787> From: Matthias Urlichs Openpgp: preference=signencrypt Autocrypt: addr=matthias@urlichs.de; prefer-encrypt=mutual; keydata= mQINBE7uOWcBEADgsF3N8L9mUekI0XLfLNQpMLq9VMwi8nyZtmJECHOajfOX8tMWua1Bh4qh 1XAY9cKsaHTd2Ik88I5pczS2HKIXq7d6Tusqwlh/8AwUw6i0Zo4zEG6QJemWKhatJK28C92G zIVQp8hHOIDU1nQ5jeNKGsYufTThey324Lp5kQcEnd9Qd07fXJtxReGHIT24j05jwbp0Sevr 95sYShzSjGxwGNYff1oAhIrlfpTXFcVng/S33SktFIDHaGJf0FgCVCllhohFc7Ei5DKB+4cY e1iz4aydp9wiOCkxxMGRGUkTtpUI8Q6+RPl9Md48dKZAen1HxEOaY1S4DgAISFJoN2dgzeVS tcfQHe1fkGfX1TgDd8/wXTcjImj3JubDjD36He+sW9vkiEzh9jt+YfDoNiRslMXXCiMHOcTa FPHADf6tNxBQfI63dTVOLy03K5MqKz96joc9ULVXX01S2Cxr9v7JsThMsmTcfvMH8Frf2EtF 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kYP4aXv7R9rMFnCm79FeUSYJse3ew4C1Ug0GZZJXDTJqf6sQbGdpQuKN/SLIWPjDWyMWsNkX fsVEzkSD5BLOh2EZ7CyO5+Y= Message-ID: Date: Fri, 27 Dec 2019 15:45:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <49-5dfcd100-9-66d44b80@213097787> Content-Language: en-US X-Smurf-Spam-Score: 0.0 (/) X-Smurf-Whitelist: +relay_from_hosts X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" Hi, > ethtool -K wg0 tx off rx off > > I want to know if the behavior described above with the checksum > errors is to be expected? Or is it necessary to turn those checks off > on all the interfaces? Yeah. I need that too, on one of my routers. Apparently some checksum offloading hardware gets confused by wireguard. Interestingly, on that machine fixing this problem requires turning off checksumming on the wg interface _or_ on the hardware interface, either way is sufficient. -- -- Matthias Urlichs _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard