To: Nick Bowler +Cc: netdev, Realtek linux nic maintainers, Francois Romieu 22:41 ` Francois Romieu 1 sibling, 2 replies 16+ messages in thread 16:37 Bogus frames transmitted with r8169 & fragmentation & large mtu Nick 19:13 ` Eric Dumazet * Re: Bogus frames transmitted with r8169 & fragmentation & large mtu (2.6.39) as well, even though the driver only let me go to 7200 byte mtu There are no unusual messages in dmesg and this was all run with latest Pings (say, = 40k bytes) seem to fail 100% of the time, and inīetween most pings fail but the occasional one makes it through.Įverything works at all sizes with 1500 byte MTU. It's not entirely consistent in how things fail. I'll see about putting a discrete networkĬard in this computer to see if that helps any. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)īecause the other machine (which has a Marvell controller) transmitsįine as far as I can tell. It seems to be specific to the particular network chipset on thisĮthernet controller: Realtek Semiconductor Co., Ltd. Nevertheless, the total length is correct for the missing fragment. I've attached the wireshark capture (gzipped) since it's small enough. Which is split into 4 frames, 3 of which (first, second and last) lookĬorrect but the fourth consists entirely of 0x42 octets, including theĮthernet and IP headers (so the source address is 42:42:42:42:42:42, theĭestination address is 42:42:42:42:42:42, ethertype is 0x4242, etc.) The payload data have made it onto the wire as the headers.

See that one of the fragments transmitted is totally bogus: portions of Investigating further, I was able to reproduce the Occasional failure with large datagrams (requiring several fragments, We were testing IPsec with large mtu sizes (9000 bytes) and noticed the To: netdev +Cc: Realtek linux nic maintainers, Francois Romieu 22:41 ` Francois Romieu 0 siblings, 2 replies 16+ messages in thread Bogus frames transmitted with r8169 & fragmentation & large mtu Netdev Archive on help / color / mirror / Atom feed * Bogus frames transmitted with r8169 & fragmentation & large mtu 16:37 Nick Bowler

Realtek rtl8168d 8111d drivers