Solved VLAN tagging not working with a TRUNK port on a switch?

K

kktr

Hi,

I am playing with 3 things:

A) FreeBSD 10.1-p6 RELEASE amd64
B) Tp-Link TL-SG3424 L2 Switch
C) A PC.

I can't seem to reach the PC from the FreeBSD router and vice versa when using VLAN tagging on the FreeBSD box and a TRUNK port on the switch to the FreeBSD box.

It works fine without any VLANs at all, or if I use VLANs only within the switch (and no VLAN tagging on the FreeBSD box).

e.g
# ifconfig sk0 inet 10.10.10.1/24
Code: 
INTERNET<---WAN(bge0)--->[FREEBSD]<---LAN(sk0)--->([PORT 1 ACCESS VLAN 100 PVID 100][TPLINK SWITCH][PORT 2 ACCESS VLAN 100 PVID 100])<---->PC

A) Configuration:
- Freshly installed (just updated via freebsd-update)
2 NICs: bge0 (WAN), sk0 (LAN)

/etc/rc.conf
Code: 
# WAN
ifconfig_bge0="inet XXX.XXX.XXX.XXX netmask 255.255.255.0"
defaultrouter="XXX.XXX.XXX.XXX"
# LAN
gateway_enable="YES"
vlans_sk0="100"
ifconfig_sk0_100="inet 10.10.10.1/24"

/etc/sysctl.conf
Code: 
net.inet.ip.forwarding=1
net.inet.ip.fastforwarding=1
net.inet.ip.redirect=0

B) Tp-Link Switch Configuration
Is by default set to factory defaults, i.e
All ports belong to VLAN 1 and are of type ACCESS and PVID 1

My only changes:
PORT 1 set to TRUNK VLAN 100 PVID 100
PORT 2 set to ACCESS VLAN 100 PVID 100

C) PC Configuration
Code: 
ip address 10.10.10.2
netmask 255.255.255.0
gateway 10.10.10.1
dns 8.8.8.8

FreeBSD router is connected to PORT 1 of the Switch
PC is connected to PORT 2 of the Switch

Code: 
INTERNET<---WAN(bge0)--->[FREEBSD]<---LAN(sk0.100)--->([PORT 1 TRUNK VLAN 100 PVID 100][TPLINK SWITCH][PORT 2 ACCESS VLAN 100 PVID 100])<---->PC

ifconfig -v
Code: 
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=8009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LINKSTATE>
        ether 00:22:22:38:b3:27
        inet XXX.XXX.XXX.XXX netmask 0xffffff00 broadcast XXX.XXX.XXX.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
sk0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=80009<RXCSUM,VLAN_MTU,LINKSTATE>
        ether 00:21:31:3b:40:15
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet 127.0.0.1 netmask 0xff000000
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        groups: lo
sk0.100: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:21:31:3b:40:15
        inet 10.10.10.1 netmask 0xffffff00 broadcast 10.10.10.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        vlan: 100 parent interface: sk0
        groups: vlan

FreeBSD to PC
ping 10.10.10.2
Code: 
ping: sento: Host is down
tcpdump on FreeBSD
tcpdump -i sk0.100
Code: 
13:21:33.301577 ARP, Request who-has 10.10.10.2 tell 10.10.10.1, length 28
13:21:34.319573 ARP, Request who-has 10.10.10.2 tell 10.10.10.1, length 28

arp -a
Code: 
...
? (10.10.10.2) at (incomplete) on sk0.100 expired [vlan]

PC to FreeBSD
ping 10.10.10.1
Code: 
Reply from 10.10.10.1: Destiniation host unreachable
tcpdump on FreeBSD
tcpdump -i sk0.100
Code: 
no traffic at all

Is there any error in my setup?
Unplugging the cables, rebooting the PC, FreeBSD, Switch has no effect and to me it seems that the configuration I've done should work fine with a TRUNK port to the FreeBSD router and VLAN tagging on it.

Thank you.
 
Have you tried adding the following to /etc/rc.conf?
Code: 
ifconfig_sk0="up"
I have that on my server (although I'm using em device). I've never been 100% certain that it is needed, but I've never tried removing it as my setup works and I don't want to risk breaking it. However, in your ifconfig output, the UP keyword is missing from the sk0 flags, and I think the interface won't do a lot unless it's marked up.
 
Hi

Adding
Code: 
ifconfig_sk0="up"
to rc.conf helped. Rebooted the FreeBSD box and I could ping either machine.

On second thought it makes sense since there is no IP address explicitly assigned so the interface is down by default. However I swear I did try typing manually ifconfig sk0 up at some point and it seemed to have no effect.

Thank you!
 
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