Hi, here the last message of redhat: /The issue has been fixed upstream: -commit 7c8f4e6dc30996bff806285730a0bb4e714d3d52 Author: Jason A. Donenfeld ////Date: Tue Jun 26 01:39:32 2018 +0200 fib_rules: match rules based on suppress_* properties too Two rules with different values of suppress_prefix or suppress_ifgroup are not the same. This fixes an -EEXIST when running: $ ip -4 rule add table main suppress_prefixlength 0 Signed-off-by: Jason A. Donenfeld ////Fixes: f9d4b0c1e969 ("fib_rules: move common handling of newrule delrule msgs into fib_nl2rule")/ problem should be considered as fixed. Regards, Silvan On 06/28/2018 02:32 PM, Silvan Nagl wrote: > > > > > -------- Forwarded Message -------- > Subject: Re: wg-quick broken by iproute2 update > Date: Thu, 28 Jun 2018 11:53:59 +0200 > From: Silvan Nagl > To: stunnel@attglobal.net > > > > Hi, > > since i had to debug this problem already i can tell you it is not > iproute2 causing the problem. > The main problem is that the current standard kernel of CentOS simple > does not support the handling of "suppress_prefixlength". > Iproute2 supports it since it does not return any error while adding so > it had to be the kernel causing problems. > In essence Red Hats official answer was "It isn't a bug, RHEL7 simple > does not support it". > If you sill want to fix your problem just upgrade your kernel to > long-term or mainline. > > Regards, > Silvan > > On 06/28/2018 04:47 AM, Eddie wrote: > > Hi, > > > > I just updated both a RHEL and a CentOS system from 7 -> 7.5. > > Following this, when running wg-quick, the routing tables are not > > updated correctly.  Both systems are running > > iproute.x86_64-4.11.0-14.el7, but from different repositories and are > > definitely different builds as they install to different sbin libraries. > > > > Here's what I'm seeing: > > > > [eddieath@oc8361880017 ~]$ sudo ip rule list > > 0:    from all lookup local > > 32766:    from all lookup main > > 32767:    from all lookup default > > [eddieath@oc8361880017 ~]$ > > [eddieath@oc8361880017 ~]$ sudo wg-quick up wg0 > > [#] ip link add wg0 type wireguard > > [#] wg setconf wg0 /dev/fd/63 > > [#] ip address add 192.168.0.11/24 dev wg0 > > [#] ip link set mtu 1420 dev wg0 > > [#] ip link set wg0 up > > [#] ip -4 route add 0.0.0.0/0 dev wg0 table 51820 > > [#] ip -4 rule add not fwmark 51820 table 51820 > > [#] ip -4 rule add table main suppress_prefixlength 0 > > [eddieath@oc8361880017 ~]$ > > [eddieath@oc8361880017 ~]$ sudo ip rule list > > 0:    from all lookup local > > 32764:    from all lookup main > > 32765:    not from all fwmark 0xca6c lookup 51820 > > 32766:    from all lookup main > > 32767:    from all lookup default > > [eddieath@oc8361880017 ~]$ > > > > Note the "suppress_prefixlength 0" has been dropped, which really > > breaks the routing with a "normal" main ahead of table 51820. > > Following this, when running the "down", the duplicated table is not > > removed, as there is no match searching for "suppress_prefixlength 0": > > > > [eddieath@oc8361880017 ~]$ sudo wg-quick down wg0 > > [#] wg showconf wg0 > > sync: ignoring all arguments > > [#] ip -4 rule delete table 51820 > > [#] ip link delete dev wg0 > > [eddieath@oc8361880017 ~]$ sudo ip rule list > > 0:    from all lookup local > > 32764:    from all lookup main > > 32766:    from all lookup main > > 32767:    from all lookup default > > [eddieath@oc8361880017 ~]$ > > > > I've confirmed this on both systems and also that the behaviour is > > purely within ip, and not anything that wg-quick is doing: > > > > [eddieath@oc8361880017 ~]$ sudo ip rule list > > 0:    from all lookup local > > 32766:    from all lookup main > > 32767:    from all lookup default > > [eddieath@oc8361880017 ~]$ sudo ip -4 rule add table main > > suppress_prefixlength 0 > > [eddieath@oc8361880017 ~]$ sudo ip rule list > > 0:    from all lookup local > > 32765:    from all lookup main > > 32766:    from all lookup main > > 32767:    from all lookup default > > [eddieath@oc8361880017 ~]$ > > > > Cheers. > > > > _______________________________________________ > > WireGuard mailing list > > WireGuard@lists.zx2c4.com > > https://lists.zx2c4.com/mailman/listinfo/wireguard > > > > _______________________________________________ > WireGuard mailing list > WireGuard@lists.zx2c4.com > https://lists.zx2c4.com/mailman/listinfo/wireguard