vlan issues with 7.0-RC3

[Pyun YongHyeon]

On Mon, Feb 25, 2008 at 01:17:12AM -0800, Christopher Cowart wrote:
 > Hello,
 > 
 > I have a mac mini running 7.0-RC3, which I'm trying to turn it into a
 > router. I have a Linksys SRW2008 "fully managed" (via an IE only web
 > interface, ick) switch. 
 > 
 > Switch:
 >   Port 1 - Trunk vlans 10,60,98 - FreeBSD Box
 >   Port 7 - Access vlan 98 - Existing LAN (192.168.1.0/24)
 > 
 > OpenWRT (192.168.1.1):
 >   WRT54G box on the Existing LAN
 > 
 > FreeBSD Box:
 >   ifconfig msk0 up
 >   ifconfig vlan98 create vlan 98 vlandev msk0 inet 192.168.1.67/24
 > 
 > With this configuration, I can ping hosts on the other lan segment (Port
 > 7). Arp and icmp seem to be quite happy. Unfortunately, I'm not having
 > any luck with tcp and udp. Any attempt to ssh to OpenWRT or dig
 > @OpenWRT hangs indefinitely. If I do a tcpdump, I see the SYN or A?
 > leaving and absolutely no response returning. If I run a tcpdump on
 > OpenWRT, I see no incoming traffic.
 > 
 > When I try to connect *to* the FreeBSD box from the other lan segment, I
 > continue to have problems. tcpdump shows the SYNs arriving via vlan98
 > and the FreeBSD box responding with SYN-ACK. OpenWRT receives the SYNACK.
 > 
 > I disabled ipfw just to be sure (sysctl -w net.inet.ip.fw.enable=0), but
 > it had no effect on the problem. If I connect the FreeBSD box to a vlan
 > 98 access port and assign the address to msk0, my connectivity problems
 > go away. This leads me to believe that the firewall on OpenWRT is not
 > the problem and the problem is related to vlans.
 > 
 > Thinking it was a problem with the not-so-cheap Linksys POS (bitterness
 > about the IE web interface again), I plugged my MacBook (running
 > Leopard, not FreeBSD) into the trunk port. Running the ifconfig commands
 > above (s/msk0/en0/), I got up and running without any problems. This
 > causes me to suspect the FreeBSD box.
 > 
 > Does anyone have any idea what's going on here? Any suggestions for
 > further troubleshooting?
 > 

Try disabling hardware features one by one in msk(4) and see how
it goes.
 o Disable TSO.
 o Disable Tx checksum offload.
 o Disable VLAN hardware tagging.

-- 
Regards,
Pyun YongHyeon