Re: Xen and Netbsd's agr [LONG]

[Etienne <etienne.pub%magickarpet.org@localhost>]

Selon "Brian A. Seklecki (Mobile)" 
<bseklecki%collaborativefusion.com@localhost>:

> On Tue, 2008-12-30 at 01:08 +0100, Etienne wrote:
> > DHCPDISCOVER on xennet0 to 255.255.255.255 port 67 interval 3
>
> So no DHCP responses.

Well, see below. And just to help you:
 - hercules is my DOM0
 - vanguard is my DOMU
 - shackleton runs dhcpd

> Can you see these DHCP requests going out of agr0?

Yes. On a completely different machine on the same network, I have:

# tcpdump udp portrange 67-68
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
10:13:44.650596 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from aa:00:00:ed:61:f5 (oui Unknown), length 300
10:13:51.650787 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from aa:00:00:ed:61:f5 (oui Unknown), length 300
10:14:02.651328 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from aa:00:00:ed:61:f5 (oui Unknown), length 300


> Is the Xen interface getting added to bridge0?
>   % brconfig -a

Yes, it is.

# brconfig -a
bridge0: flags=41<UP,RUNNING>
        Configuration:
                priority 32768 hellotime 2 fwddelay 15 maxage 20
                ipfilter disabled flags 0x0
        Interfaces:
                xvif1.0 flags=3<LEARNING,DISCOVER>
                        port 8 priority 128
                agr0 flags=3<LEARNING,DISCOVER>
                        port 6 priority 128
        Address cache (max cache: 100, timeout: 1200):
                aa:00:00:ee:61:f5 agr0 1123 flags=0<>
                aa:00:00:ed:61:f5 agr0 1122 flags=0<>
                00:c0:ca:18:ef:fb agr0 980 flags=0<>
                aa:00:00:46:b5:2f agr0 930 flags=0<>
                aa:00:00:50:02:f0 agr0 915 flags=0<>
                00:13:d4:3b:7a:a0 agr0 915 flags=0<>

And I can see the DHCP requests have been answered in my DHCP server
/var/log/messages:
Dec 30 10:24:03 shackleton dhcpd: DHCPDISCOVER from aa:00:00:ed:61:f5 via
xennet0
Dec 30 10:24:03 shackleton dhcpd: DHCPOFFER on 192.168.1.179 to
aa:00:00:ed:61:f5 via xennet0

And then, while running tcpdump on the DOM0, I get:
tcpdump: WARNING: rtk0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on rtk0, link-type EN10MB (Ethernet), capture size 96 bytes
10:44:35.010523 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from aa:00:00:ed:61:f5, length: 300
10:44:35.012029 IP shackleton.freebox.1.168.192.in-addr.arpa.bootps >
vanguard.freebox.1.168.192.in-addr.arpa.bootpc: BOOTP/DHCP, Reply, length: 300
10:44:41.010410 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from aa:00:00:ed:61:f5, length: 300
10:44:41.011862 IP shackleton.freebox.1.168.192.in-addr.arpa.bootps >
vanguard.freebox.1.168.192.in-addr.arpa.bootpc: BOOTP/DHCP, Reply, length: 300

-- 
Etienne