suse@a-domani.nl wrote:
On 2018-01-05 11:10, Per Jessen wrote:
suse@a-domani.nl wrote:
Reason for asking, is thatI used a SuSE box as a firewall. One leg to cable-modem (the one with the 1472 MTU) others to internal servers, clients or wifi-modem Besides that, on the machine itself I have some virtualized machines doing common tasks like dns
So all other (internal) interfaces (and bridges) I kept at the default MTU 1500 bytes, But one physical interface should be changed for certain, but I wonder if the corresponding virtual-bridge device should also lower its mtu
Your WAN interface is part of bridge? I am not sure, but I expect it should be sufficient to change the bridge MTU.
eth1 is connected to the cable modem; fw6:~ # ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:08:C7:E6:9A:3D inet6 addr: fe80::208:c7ff:fee6:9a3d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8531668002 errors:0 dropped:0 overruns:1 frame:1 TX packets:4249592124 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:11815554011517 (11268190.3 Mb) TX bytes:416408316189 (397117.9 Mb)
fw6:~ # fw6:~ # ifconfig br1 br1 Link encap:Ethernet HWaddr 00:08:C7:E6:9A:3D inet addr:172.16.11.1 Bcast:172.16.11.255 Mask:255.255.255.0 inet6 addr: 2001:xyz:1f01:3785:1::1/80 Scope:Global inet6 addr: fe80::208:c7ff:fee6:9a3d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8498737383 errors:0 dropped:0 overruns:0 frame:0 TX packets:4249592140 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:11695013314138 (11153233.8 Mb) TX bytes:416408323489 (397117.9 Mb)
fw6:~ # brctl show br1 bridge name bridge id STP enabled interfaces br1 8000.0008c7e69a3d no eth1
Currently both eth1 AND br1 have a MTU of 1500
Hi Hans Having thought about it, I think you need to change the MTU of the physical device, eth1. Assuming you have physical access, I would just try it out ip link set mtu xxxx dev eth1 then check the device see if the mtu changes propagate to br1. The MTU is just as easily reset. /Per -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org