cc-ing netdev On Tue, Jun 10, 2014 at 12:43 PM, Egerváry Gergely <gerg...@egervary.hu> wrote: > Hi, > > we have just upgraded our systems from 3.4.91 (longterm) to 3.4.92. > Since then we are experiencing dozens of MTU-related network timeout > issues. Reverting back to 3.4.91 fixes all of these problems. > > Both kernel versions are built from vanilla sources with the same > .config. These can be highly reproduced over VPN tunnels or even over > simple ethernet connections when using DNAT. (TCP port forward) It > looks like MTU path discovery is somehow affected. > > ICMP is not filtered in our network. (For testing, we flushed all > iptables rules, set all policies to ACCEPT, and problem still exists.) > We do not use any special sysctl settings. Was there any changes > related to packet forwarding or MTU discovery?
some combination of old kernel and backport of ("net: ipv4: ip_forward: fix inverted local_df test") ? just guessing > Thank you in advance, > -- > Gergely EGERVARY > Network Administrator > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/