Date: Tue, 29 Jan 2008 19:20:26 +0000 From: Tom Judge <tom@tomjudge.com> To: Alexandre Biancalana <biancalana@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: VLAN problems Message-ID: <479F7C7A.5080605@tomjudge.com> In-Reply-To: <8e10486b0801290842l5d65bb3fk8a02d731c3ad1b91@mail.gmail.com> References: <8e10486b0801290439y77568aeby6c6dbfbb5132f61d@mail.gmail.com> <479F4C3C.5070801@tomjudge.com> <8e10486b0801290842l5d65bb3fk8a02d731c3ad1b91@mail.gmail.com>
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Alexandre Biancalana wrote:
> Hi Tom ! Thanks for your help!
>
> I had to step back the chance an put the "old" gateway back, the
> performance was unacceptable :-(
>
> Looking closer I see that still have the problem using the old gateway
> too, in a small scale because I only use vlan to external links.
>
> This old gateway is running 6.2-STABLE and have 4 network interfaces:
> fxp0, fxp1, sk0 and sk1.
>
> fxp0, sk0 and sk1 are no parent of any vlans, are connected to
> internal networks and work without problems, follow the ifconfig
> ouput:
>
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> options=8<VLAN_MTU>
> inet 10.11.0.1 netmask 0xffff0000 broadcast 10.11.255.255
> ether 00:02:a5:41:c6:b2
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> options=b<RXCSUM,TXCSUM,VLAN_MTU>
> inet 10.2.0.36 netmask 0xffff0000 broadcast 10.2.255.255
> ether 00:0a:5e:5c:9e:2e
> media: Ethernet autoselect (1000baseTX <full-duplex,flag0,flag1>)
> status: active
> sk1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> options=b<RXCSUM,TXCSUM,VLAN_MTU>
> inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
> ether 00:0a:5e:5c:27:ef
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
>
> fxp1 is parent of 7 vlan interfaces: vlan16, vlan20, vlan200, vlan201,
> vlan202 and vlan205 that connect my internal network to some external
> links, follow the ifconfig output:
>
> vlan200: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> inet 10.200.0.1 netmask 0xfffffffc broadcast 10.200.0.3
> ether 00:0c:f1:ac:91:09
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> vlan: 200 parent interface: fxp1
> vlan201: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> inet 10.200.0.5 netmask 0xfffffffc broadcast 10.200.0.7
> ether 00:0c:f1:ac:91:09
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> vlan: 201 parent interface: fxp1
> vlan202: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> inet 10.200.0.9 netmask 0xfffffffc broadcast 10.200.0.11
> ether 00:0c:f1:ac:91:09
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> vlan: 202 parent interface: fxp1
> vlan205: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
> inet 10.0.0.9 netmask 0xfffffffc broadcast 10.0.0.11
> ether 00:0c:f1:ac:91:09
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
>
> Like seen before netstat -niW show output errors in vlan interfaces
>
> # netstat -niW
> Name Mtu Network Address Ipkts Ierrs Opkts
> Oerrs Coll
> vlan201 1500 <Link#11> 00:0c:f1:ac:91:09 53524 0 52234
> 63 0
> vlan202 1500 <Link#12> 00:0c:f1:ac:91:09 5907 0 4421
> 4 0
> vlan205 1500 <Link#15> 00:0c:f1:ac:91:09 9728659 0 9373148
> 87025 0
>
> (the vlan205 is the most used and the output error is increasing...)
>
Taking a quick look through if_vlan.c it seems that the output error
counter (ifp->if_oerrors) is only incremented in 3 places:
1) Then padding short frames that are valid with the vlan tag but runts
when they have the tag stripped.
2) When inserting the VLAN tag in to the packet when the underlying
interface does not support vlan hardware tagging.
3) When IFW_HANDOFF fails to hand the packet off to the parent interface.
Do you have any error messages on the console in dmesg? ('cannot pad
short frame', 'unable to prepend vlan header' for example).
Tom
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