Date: Tue, 29 Jan 2008 15:54:36 +0000 From: Tom Judge <tom@tomjudge.com> To: Alexandre Biancalana <biancalana@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: VLAN problems Message-ID: <479F4C3C.5070801@tomjudge.com> In-Reply-To: <8e10486b0801290439y77568aeby6c6dbfbb5132f61d@mail.gmail.com> References: <8e10486b0801290439y77568aeby6c6dbfbb5132f61d@mail.gmail.com>
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Alexandre Biancalana wrote: > Hi list, > > I changed the company gateway implementing vlan concept and now I > have a lot of slow and packet loss. > > I'm running FreeBSD FW1 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #0: > Fri Jan 25 10:36:18 UTC 2008 root@FW1:/usr/obj/usr/src/sys/FW > amd64 > > This server is an Dell Power Edge 1950, QuadCore 2.83, 2Gb Ram, one > bce gigabit interface connected to a gigabit port of a Cisco 4500 in > trunk mode. There are 10 vlans configured on top of bce1 interface. I > made this change last night and with small traffic all was ok, but > with the increase of the traffic during normal daily usage, we are > experiencing too much packet loss and slow connections. > > I change the mtu of bce to 9000, this help something but I still > have bad performance. I think that this could be related with mtu, but > I don't know where and what to change. I have seen some problems if you try to run more than one MTU on different VLANS with the same parent interface. For example if you set the parent interface MTU and vlan1 to 9000 and then tried to change vlan2 to have a 1500 byte mtu then the change of mtuon the vlan would also change the mtu on the parent. If you are not running jumbo frames or nested vlans I don't think that changing the mtu of the interface is going to help you. The output of ifconfig would also help people give you more help with this. Tom > > Googling around I found some references that said to test mtu with > ping and here are the results: > > # ping -D -s 1473 192.168.0.5 > PING 192.168.0.5 (192.168.0.5): 1473 data bytes > ping: sendto: Message too long > ping: sendto: Message too long > --- 192.168.0.5 ping statistics --- > 6 packets transmitted, 0 packets received, 100.0% packet loss > > # ping -D -s 1400 10.2.0.36 > PING 10.2.0.36 (10.2.0.36): 1400 data bytes > 1408 bytes from 10.2.0.36: icmp_seq=0 ttl=64 time=86.026 ms > 1408 bytes from 10.2.0.36: icmp_seq=1 ttl=64 time=5.558 ms > --- 10.2.0.36 ping statistics --- > 3 packets transmitted, 2 packets received, 33% packet loss > round-trip min/avg/max/stddev = 5.558/45.792/86.026/40.234 ms > > > Looking at netstat -ni output I have output errors too: > > # netstat -niW > Name Mtu Network Address Ipkts Ierrs Opkts > Oerrs Coll > bce0* 1500 <Link#1> 00:1d:09:67:8d:f1 0 0 0 > 0 0 > bce1 9000 <Link#2> 00:1d:09:67:8d:ef 83289870 0 80535996 > 0 0 > pflog0 33160 <Link#3> 0 0 1153529 > 0 0 > lo0 16384 <Link#4> 516657 0 516661 > 0 0 > lo0 16384 127.0.0.0/8 127.0.0.1 4041401 - 516661 > - - > pfsync0 1460 <Link#5> 0 0 0 > 0 0 > vlan2 1500 <Link#6> 00:1d:09:67:8d:ef 37445062 0 32727529 > 1047565 0 > vlan2 1500 10.2.0.0/16 10.2.0.36 636786 - 3000823 > - - > vlan11 1500 <Link#7> 00:1d:09:67:8d:ef 33865371 0 36676651 > 993848 0 > vlan11 1500 10.11.0.0/16 10.11.0.1 51270 - 1147250 > - - > vlan16 1500 <Link#8> 00:1d:09:67:8d:ef 388 0 19 > 0 0 > vlan16 1500 10.16.0.0/24 10.16.0.1 5 - 13 > - - > vlan20 1500 <Link#9> 00:1d:09:67:8d:ef 1483 0 1 > 0 0 > vlan20 1500 10.20.0.0/24 10.20.0.1 636 - 0 > - - > vlan200 1500 <Link#10> 00:1d:09:67:8d:ef 390 0 3 > 0 0 > vlan200 1500 10.200.0.0/30 10.200.0.1 0 - 0 > - - > vlan201 1500 <Link#11> 00:1d:09:67:8d:ef 19153 0 19274 > 3408 0 > vlan201 1500 10.200.0.4/30 10.200.0.5 0 - 0 > - - > vlan202 1500 <Link#12> 00:1d:09:67:8d:ef 8338 0 6694 > 1074 0 > vlan202 1500 10.200.0.8/30 10.200.0.9 0 - 0 > - - > vlan203 1528 <Link#13> 00:1d:09:67:8d:ef 1691886 0 1429174 > 86768 0 > vlan203 1528 192.168.0.0/2 192.168.0.1 35672 - 31375 > - - > vlan204 1500 <Link#14> 00:1d:09:67:8d:ef 1256 0 3 > 0 0 > vlan204 1500 10.0.0.84/30 10.0.0.85 0 - 0 > - - > vlan205 1500 <Link#15> 00:1d:09:67:8d:ef 10256373 0 9676750 > 626525 0 > vlan205 1500 10.0.0.8/30 10.0.0.9 2509909 - 2667896 > - - > > > Any help is very appreciated, > > Regards, > Alexandre Biancalana > > PS: Please cc me, because I'm not subscribed in the list. > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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