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Date: Tue, 10 Jun 2014 21:43:53 +0200 From: Egerváry Gergely <gergely@...rvary.hu> To: linux-kernel@...r.kernel.org Subject: 3.4.92 MTU issues 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? 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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