#18590: MTU issue involving bridge or VLAN ?
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Reporter: ambrosa | Owner: developers
Type: defect | Status: new
Priority: high | Milestone: Chaos Calmer (trunk)
Component: base system | Version: Trunk
Resolution: | Keywords:
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Comment (by anonymous):
This issue happens applies also when doing software bridging on all
switchports, (because the switch works as a Hub and forwards all packets
to all ports, see https://dev.openwrt.org/ticket/15511).
Test config on a tp-w8970 is:
config switch_vlan
option device 'switch0'
option vlan '1'
option ports '5 6t'
config switch_vlan
option device 'switch0'
option vlan '2'
option ports '0 6t'
config switch_vlan
option device 'switch0'
option vlan '3'
option ports '2 6t'
config switch_vlan
option device 'switch0'
option vlan '4'
option ports '4 6t'
config interface 'lan'
option force_link '1'
option type 'bridge'
option proto 'manual'
option ip6assign '64'
option ifname 'eth0.1 eth0.2 eth0.3 eth0.4'
option macaddr 'c0:1d:c0:ff:ee:23'
option auto '1'
option mtu 1496
option ipaddr '10.0.0.1'
option netmask '255.255.255.0'
If I set MTU 1496 everthing is fine. With an higher MTU i get packet loss.
Increasing the MTU on eth0.[1234] or eth0 does not work. It stays at max
1500.
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Ticket URL: <https://dev.openwrt.org/ticket/18590#comment:5>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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