| --- | Log | opened Mon Mar 17 00:00:30 2008 |
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| 05:34 | <rVerS:#uml> | hi |
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| 10:37 | <jdike:#uml> | Hi guys |
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| 10:57 | * | jdike:#uml chased Nix's lead on a sleep bug |
| 10:57 | <jdike:#uml> | chases |
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| 15:30 | <chasmo77:#uml> | greets. I'm having trouble following the networking steps in the book. Can someone help me along? |
| 15:31 | <chasmo77:#uml> | s/the book/User Mode Linux/ |
| 15:34 | <jdike:#uml> | what's the problem? |
| 15:40 | <chasmo77:#uml> | jdike, thanks for your reply. I've got arping on the UML instance, but it doesn't reach the host |
| 15:40 | <jdike:#uml> | how have you determined this? |
| 15:41 | <chasmo77:#uml> | tcpdump -i tap0 -l -n |
| 15:41 | <chasmo77:#uml> | I can see the arp who-has on the UML instance |
| 15:42 | <chasmo77:#uml> | but not on the host |
| 15:42 | <jdike:#uml> | you see it with tcpdump on the UML eth0? |
| 15:42 | <chasmo77:#uml> | correct |
| 15:42 | <chasmo77:#uml> | ooops.. let me check |
| 15:44 | <chasmo77:#uml> | no, not on eth0, just icmp Dest Host Unreachable's |
| 15:45 | <jdike:#uml> | what's prompting this? You're trying to ping the host? |
| 15:46 | <chasmo77:#uml> | yes, trying to ping the host. Should the pings be going out over eth0 or over the tap0 device? |
| 15:46 | <jdike:#uml> | both |
| 15:46 | <jdike:#uml> | they go into the UML eth0 and pop out of the host tap0 |
| 15:47 | <jdike:#uml> | but you're not even getting to the ping part |
| 15:47 | <jdike:#uml> | what does your routing table look like? |
| 15:47 | <chasmo77:#uml> | Aha! that has been missing from my mental model |
| 15:47 | <chasmo77:#uml> | route -n shows a host route to the host via tap0, |
| 15:47 | <jdike:#uml> | paste it here |
| 15:48 | <chasmo77:#uml> | Destination Gateway Genmask Flags Metric Ref Use Iface |
| 15:48 | <chasmo77:#uml> | 10.1.0.199 0.0.0.0 255.255.255.255 UH 0 0 0 tap0 |
| 15:48 | <jdike:#uml> | the UML eth0 <-> host tap0 connection is a ptp connection, basically |
| 15:48 | <jdike:#uml> | this is on the host or UML? |
| 15:48 | <chasmo77:#uml> | 10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 tap0 |
| 15:48 | <chasmo77:#uml> | on the UML |
| 15:49 | <jdike:#uml> | why do you have a tap0 inside the UML? |
| 15:50 | <chasmo77:#uml> | it pops up when I start the UML with "eth0=tuntap,tap0" |
| 15:50 | <jdike:#uml> | no it doesn't |
| 15:50 | <chasmo77:#uml> | hmm, not sure why then. let me check my notes and logs carefully. |
| 15:50 | <jdike:#uml> | one should pop up on the host, but not inside UML |
| 15:51 | <jdike:#uml> | well, if you specify tap0 on the UML command line, it should be already set up |
| 15:51 | <jdike:#uml> | on the host |
| 15:51 | <chasmo77:#uml> | aha |
| 15:52 | <chasmo77:#uml> | I suspect a mis-configured kernel... I manually enabled tun device when I compiled the kernel. |
| 15:53 | <jdike:#uml> | host or UML? |
| 15:53 | <chasmo77:#uml> | UML |
| 15:53 | <jdike:#uml> | doesn't matter |
| 15:54 | <chasmo77:#uml> | hrmmm. Then I don't know why tap0 appears on the UML. |
| 15:54 | <jdike:#uml> | there's no UML eth0? |
| 15:55 | <chasmo77:#uml> | Yes, there's a UML eth0 |
| 15:55 | <jdike:#uml> | is it up? |
| 15:55 | <jdike:#uml> | take tap0 down |
| 15:55 | <chasmo77:#uml> | yes |
| 15:55 | <chasmo77:#uml> | inet addr:10.1.0.198 Bcast:10.1.0.255 Mask:255.255.255.0 |
| 15:56 | <jdike:#uml> | what's left in the routing table once tap0 is down? |
| 15:56 | <chasmo77:#uml> | 0.0.0.0 10.1.0.199 0.0.0.0 UG 1 0 0 eth0 |
| 15:57 | <chasmo77:#uml> | plus of course the lo route |
| 15:57 | <jdike:#uml> | OK |
| 15:57 | <jdike:#uml> | how did you configure the host tap0? |
| 15:57 | <chasmo77:#uml> | ifconfig tap0 10.1.0.199 netmask 255.255.255.0 up |
| 15:58 | <jdike:#uml> | OK |
| 15:58 | <jdike:#uml> | what does ping do now? |
| 15:58 | <chasmo77:#uml> | now I see packets arriving on the host side, but no returns (yet) |
| 15:59 | <jdike:#uml> | is there a host route to .198 through tap0? |
| 16:00 | <chasmo77:#uml> | no, I had been counting on routing to .200 |
| 16:00 | <chasmo77:#uml> | I'll try installing a route to .198 |
| 16:01 | <jdike:#uml> | why? |
| 16:02 | <chasmo77:#uml> | okay, I'll chill |
| 16:02 | <jdike:#uml> | you make the UML eth0 .198, what good is a route to .200? |
| 16:02 | <chasmo77:#uml> | i see your point |
| 16:04 | <caker:#uml> | chasmo77: you may also want to look into this -> http://edeca.net/articles/bridging/index.html as an alternative |
| 16:04 | <chasmo77:#uml> | okay, I have pinging from UML -> host going all the way thru! |
| 16:05 | <jdike:#uml> | bridging is more complicated to set up |
| 16:05 | <chasmo77:#uml> | bingo: ping from host to UML is now working as well |
| 16:06 | <chasmo77:#uml> | I looked at the briding setup, looks like it may be problem for me, as my host is a remote host and I'm ssh'ing into it |
| 16:06 | <chasmo77:#uml> | thanks 1x10E6 for you help |
| 16:06 | <chasmo77:#uml> | s/briding/bridging/ |
| 16:07 | <jdike:#uml> | yeah, you need to be brave (or an extra network interface) to set up bridging on a remote server |
| 16:10 | <chasmo77:#uml> | thanks again |
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| --- | Log | closed Tue Mar 18 00:00:09 2008 |
