Hi, I came across a similar situation with a realtek 8111DL chipset. If you go to the realtek website, it explicitly says for that chipset that jumbo frames up to 9K are supported. For some of the other (cheaper?) chipsets, such as the 8111B, it does not say this. So this may well be a real limitation of the chipset.
The problem I had is that the standard realtek (8139?) driver was loaded for the 8111 by default. I think within this driver the limitation to 7200 bytes is likely to exist and I could not increase the MTU above 7200. Following a post on some other forum, I went to the realtek website and downloaded their 8168 linux driver which supports the 8168/8111DL chips. This is painless and trivial to install and it just compiles a kernel module and overwrites the existing realtek driver. (A bit dodgey, but OK if you are careful about kernel updates.) After this, I could set the MTU to 9000. Hope this is helpful. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/777534 Title: ifconfig eth0 mtu 7000 works but 9000 does not To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/777534/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
