netfilter buglog - Mar 2016 - [Bug 1058] New: Add clamp MSS to MTU

https://bugzilla.netfilter.org/show_bug.cgi?id=1058

            Bug ID: 1058
           Summary: Add clamp MSS to MTU
           Product: nftables
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: luminarior at gmail.com

Please, add analog for nft to the following command in iptables:
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
It's useful to set on router for sites which don't support Path MTU
Discovery
mechanism correctly and in networks behind PPPoE etc.

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ddd <luminarior at gmail.com> changed:

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                 CC|                            |luminarior at gmail.com

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Simon Gomizelj <simon at vodik.xyz> changed:

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Oleksandr Natalenko <oleksandr at natalenko.name> changed:

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Nils S. <me at lochnair.net> changed:

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                 CC|                            |me at lochnair.net

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5bbcc2f9 at opayq.com changed:

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                 CC|                            |5bbcc2f9 at opayq.com

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--- Comment #1 from 5bbcc2f9 at opayq.com ---
*** Bug 1165 has been marked as a duplicate of this bug. ***

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Florian Westphal <fw at strlen.de> changed:

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                 CC|                            |fw at strlen.de
           Assignee|pablo at netfilter.org         |fw at strlen.de
             Status|NEW                         |ASSIGNED

--- Comment #2 from Florian Westphal <fw at strlen.de> ---
kernel patches to add tcp option write support have been posted here:
https://patchwork.ozlabs.org/patch/799166/

Patches for userspace will follow once kernel changes have been accepted.

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Florian Westphal <fw at strlen.de> changed:

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         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #3 from Florian Westphal <fw at strlen.de> ---
Added in Linux 4.14:

tcp flags syn tcp option maxseg size set 1400
tcp flags syn tcp option maxseg size set rt mtu

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