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Old 10th January 2011
unixjingleman unixjingleman is offline
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Default networking not working

Hi
My OpenBSD install went fine. My network cards were detected as xl0 and xl1.
On the first boot i did:
Code:
#ifconfig -a
to see if my interfaces had acquired I.Ps. yes they had. then i did:
Code:
#ping 192.168.2.234
this is the gateway. The response i got reported 100% packet loss. This was the same for both interfaces. The ethernet cards are old 3com cards which i thought would work with OpenBSD for sure. One of the cards came straight from a machine that ran Linux and it worked in that.
So i did a sniff with tcpdump and the OpenBSD box wasn't getting replies from arp requests that it had issued in an attempt to find it's own MAC address so it could ping the gateway. The arp cache on this OpenBSD box is emtpy and it doesn't respond to the gateway's arp requests addressed to it. I'm using the default install(generic kernel)
Any ideas?
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Old 10th January 2011
J65nko J65nko is offline
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Please post the output of
  • ifconfig -A
  • netstat -rn -f inet
  • sysctl | grep forward
  • cat /etc/mygate
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Old 10th January 2011
BSDfan666 BSDfan666 is offline
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Also include a detailed network topology, annotated firewall rulesets.. and perhaps a clue.
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Old 10th January 2011
unixjingleman unixjingleman is offline
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Here's the output of netstat -rn:Routing tables

Code:
Internet:
Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
default            192.168.1.254      GS         0        0     -     8 xl0  
127/8              127.0.0.1          UGRS       0        0 33200     8 lo0  
127.0.0.1          127.0.0.1          UH         4        0 33200     4 lo0  
192.168.1/24       link#2             C          1        0     -     4 xl1  
192.168.1.66       127.0.0.1          UGHS       0        0 33200     8 lo0  
192.168.1.67       127.0.0.1          UGHS       0        0 33200     8 lo0  
192.168.1.68       127.0.0.1          UGHS       0        0 33200     8 lo0  
192.168.1.254      link#2             HLc        1      679     -     4 xl1  
224/4              127.0.0.1          URS        0        0 33200     8 lo0
Here's the output of ifconfig -a:

Code:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33200
	priority: 0
	groups: lo
	inet 127.0.0.1 netmask 0xff000000
	inet6 ::1 prefixlen 128
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:04:76:e6:5c:4e
	priority: 0
	groups: egress
	media: Ethernet autoselect (none)
	status: no carrier
	inet6 fe80::204:76ff:fee6:5c4e%xl0 prefixlen 64 scopeid 0x1
	inet 192.168.1.66 netmask 0xffffff00 broadcast 192.168.1.255
xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:02:1c:f1:35:51
	priority: 0
	media: Ethernet autoselect (none)
	status: no carrier
	inet6 fe80::202:1cff:fef1:3551%xl1 prefixlen 64 scopeid 0x2
	inet 192.168.1.67 netmask 0xffffff00 broadcast 192.168.1.255
xl2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:01:02:b7:1b:16
	priority: 0
	media: Ethernet autoselect (100baseTX full-duplex)
	status: active
	inet6 fe80::201:2ff:feb7:1b16%xl2 prefixlen 64 scopeid 0x3
	inet 192.168.1.68 netmask 0xffffff00 broadcast 192.168.1.255
enc0: flags=0<>
	priority: 0
	groups: enc
	status: active
pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33200
	priority: 0
	groups: pflog
/etc/mygate didn't exist.So i created it and put the default gateway's I.P in. That didn't help.The output of ping is still: "ping: wrote 64 192.168.1.254 64 chars, ret =-1 \ ping: sendto: host is down"And it isn't a router yet so the sysctl variables are still set to 0. I think 3 interfaces have I.Ps
Thank you very much for your help.I put the wrong I.P in the original post cause i forgot what the gateways i.p was.

Last edited by J65nko; 10th January 2011 at 11:40 PM. Reason: Added [noparse][code][/noparse] tags ;)
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Old 10th January 2011
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xl0 and xl1 are not connected, only xl2 is an active link. Check cabling.
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Old 10th January 2011
BSDfan666 BSDfan666 is offline
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Indeed, xl0/xl1 appear down.

It also seems like you're trying to join the same subnet with each interface, are they all requesting IP's from the same DHCP server? that's a silly plan.
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Old 10th January 2011
J65nko J65nko is offline
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Code:
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:04:76:e6:5c:4e
	priority: 0
	groups: egress
	media: Ethernet autoselect (none)
	status: no carrier
	inet6 fe80::204:76ff:fee6:5c4e%xl0 prefixlen 64 scopeid 0x1
	inet 192.168.1.66 netmask 0xffffff00 broadcast 192.168.1.255
xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:02:1c:f1:35:51
	priority: 0
	media: Ethernet autoselect (none)
	status: no carrier
	inet6 fe80::202:1cff:fef1:3551%xl1 prefixlen 64 scopeid 0x2
	inet 192.168.1.67 netmask 0xffffff00 broadcast 192.168.1.255
xl2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	lladdr 00:01:02:b7:1b:16
	priority: 0
	media: Ethernet autoselect (100baseTX full-duplex)
	status: active
	inet6 fe80::201:2ff:feb7:1b16%xl2 prefixlen 64 scopeid 0x3
	inet 192.168.1.68 netmask 0xffffff00 broadcast 192.168.1.255
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Old 11th January 2011
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BSDfan has pointed out something significant, it should not be ignored.

Each NIC should be on its own subnet -- this topology is flawed.
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Old 11th January 2011
unixjingleman unixjingleman is offline
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I don't care about the overall plan of the network at this stage. I'm still trying to determine if the interfaces work with OpenBSD at all. I only have one interface attached at a time. I'm just trying to get a basic dhcp I.P working. The other machines i've got all work. so the border router works for sure. I'm just trying to get one interface talking to the net. As all the interfaces were detected i don't know why i can't achieve this simple goal. I will configure properly when i find that i can do networking at all.
Any ideas, based the output of the commands i posted?.
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Old 11th January 2011
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Yes. Look at your routing table. All your outbound routes are using your unplugged NICs.

Your "test" topology is the problem.
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Old 11th January 2011
J65nko J65nko is offline
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If the xl2 NIC still has a status: active you could do
Code:
 # dhclient xl2
And you should get an IP address from your router.
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Old 11th January 2011
unixjingleman unixjingleman is offline
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But i have an I.P address. That's not the problem. The problem is that when i try to ping the gateway i get:
ping: 192.168.1.254 64 chars, ret=-1
ping: sendto: Host is down
---192.168.1.254 ping statistics ----
9 packets transmitted, 0 packets recieved, 100% packet loss
and yet i know for a fact that the gateway isn't down
In the tcpdump output the OpenBSD box couldn't find it's own MAC address. It also didn't respond to the gateway's ARP queries to itself.
That's why i'm stuck. Thank you for all the replies though
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Old 11th January 2011
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Look at your routing table. Again:
Code:
Internet:
Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
default            192.168.1.254      GS         0        0     -     8 xl0
When you attempt to ping any address you will use xl0. xl0 is not connected.

Flush your routing table, and make sure xl0 is not in the table. Do this by using "route flush" and then examing the table once more. If xl0 is still included, delete or change the IP addresses of xl0 and xl1 to something unusable. ("ifconfig <nic> delete" or "ifconfig <nic> 10.10.10.10/24" etc.)

You want xl2 to be the only NIC in the 192.168.1/24 subnet, and a corrected routing table, if you want to communicate.
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Old 11th January 2011
unixjingleman unixjingleman is offline
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That solved it. Silly me. So the problem was that OpenBSD just was sending packets out on interfaces that weren't up. Sorry to waste time on such a simple issue and thanks again.
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Old 11th January 2011
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Silly? Not at all. Time waste? Nope.

Your refusal to accept the explanation of the root cause of your problem ... twice? I hope that was a learning experience for you.
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Old 11th January 2011
J65nko J65nko is offline
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The dhclient command would have fixed your routing tables. There are always some people who just don't try the advice given here
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