What if you set up a GRE tunnel between the two hosts, and push Wireguard traffic through the GRE interface?
Regards Lloyd Rafael Sadowski wrote: > On Wed Sep 17, 2025 at 01:28:26PM +0200, Claudio Jeker wrote: > > > On Wed, Sep 17, 2025 at 12:22:37PM +0200, Rafael Sadowski wrote: > > > > > On Wed Sep 17, 2025 at 09:33:00AM +0100, Stuart Henderson wrote: > > > > > > > > $ netstat -i > > > > > Name Mtu Network Address Ipkts Ifail Opkts Ofail Colls > > > > > ix3 1500 <Link> f8:f2:1e:3c:9c:09 195418012 0 144748154 149426 0 > > > > > wg0 1420 <Link> 95659816 367058 64488271 3933 0 > > > > > > > > do the Ofail figure rise over time or are they steady (i.e. relating to > > > > a past event or ongoing?) > > > > > > > > are they drops or errs? conpare these: > > > > > > > > netstat -I ix3 -nd > > > > netstat -I ix3 -ne > > > > > > > > is your cable ok and is there anything reported on the switch? > > > > > > Thanks Stuart for the feedback. I've done some additional debugging with > > > dlg@ and can provide more detailed information: > > > > > > The Ofail counters are ongoing and increasing during WireGuard traffic: > > > > > > # Before iperf test: > > > netstat -d -I ix3: Odrop 149596 > > > netstat -e -I ix3: Oerrs 0 > > > > > > # After iperf test: > > > netstat -d -I ix3: Odrop 149944 # +348 drops > > > netstat -e -I ix3: Oerrs 0 # No errors > > > > > > ix3 shows queue drops (not errors) that increase during WireGuard > > > traffic, while the WireGuard interface itself shows no drops > > > during the test period. > > > > While wg0 shows no or little output errors the Ifail from netstat -i above > > has 367058 failures. So that may be another thing to investigate. > > > > -- > > :wq Claudio > > > Both drop and fail counters remained constant during multiply > iperf runs with mtu 1420. > > $ netstat -d -nI wg0 > Name Mtu Network Address Ipkts Idrop Opkts Odrop Colls > wg0 1420 <Link> 96628707 367058 65237088 3942 0 > > wg0 1420 10.100/16 10.100.4.1 96628707 367058 65237088 3942 0 > > $ netstat -d -nI ix3 > Name Mtu Network Address Ipkts Idrop Opkts Odrop Colls > ix3 1500 <Link> f8:f2:1e:3c:9c:09 199515933 0 147988323 150229 0 > > > $ iperf -c remote > ------------------------------------------------------------ > Client connecting to mo-remote, TCP port 5001 > TCP window size: 16.2 KByte (default) > ------------------------------------------------------------ > [ 1] local 10.100.4.1 port 36553 connected with 10.100.3.1 port 5001 > [ ID] Interval Transfer Bandwidth > [ 1] 0.00-10.48 sec 4.38 MBytes 3.50 Mbits/sec > > $ netstat -d -nI wg0 > Name Mtu Network Address Ipkts Idrop Opkts Odrop Colls > wg0 1420 <Link> 96630871 367058 65240460 3942 0 > > wg0 1420 10.100/16 10.100.4.1 96630871 367058 65240460 3942 0 > > $ netstat -d -nI ix3 > Name Mtu Network Address Ipkts Idrop Opkts Odrop Colls > ix3 1500 <Link> f8:f2:1e:3c:9c:09 199519187 0 147992605 150229 0
