Hello
This is similar to my LQ thread
VirtualBox: how to NFS mount in Knoppix guest from Slackware host? but now the guest is Slackware64 13.1 like the host and it's not a one-off requirement that I can work around.
The host is an NFS server exporting /home/c/d to the 192.168.168.0/24 LAN:
Code:
root@CW8:~# exportfs
/home/c/d 192.168.168.0/24
This NFS export is routinely mounted by my netbook using
mount -t nfs -o bg,rw,soft 192.168.168.0:/home/c/d /mnt/CW8d
So it should (TM) be straightforward to mount it from the guest which is currently configuring its eth0 using DHCP from the LAN router's DHCP service (the same as the netbook), can ping the host, do name resolution and has no firewall:
Code:
root@vCW8:~# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 08:00:27:30:1f:8a
inet addr:192.168.168.201 Bcast:192.168.168.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe30:1f8a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3147 errors:0 dropped:0 overruns:0 frame:0
TX packets:2548 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3036808 (2.8 MiB) TX bytes:248836 (243.0 KiB)
Interrupt:19 Base address:0xd020
root@vCW8:~# ping -c1 192.168.168.7
PING 192.168.168.7 (192.168.168.7) 56(84) bytes of data.
64 bytes from 192.168.168.7: icmp_req=1 ttl=64 time=0.311 ms
[snip]
root@vCW8:~# dig linuxquestions.org
[snip]
;; ANSWER SECTION:
linuxquestions.org. 1440 IN A 75.126.162.205
[snip]
root@vCW8:~# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destinatio
The host also has no firewall (same
iptables -L output)
Running Wireshark on both host and guest shows NFS packets going from guest and being received on the host but nothing going the other way.
Running rpc.nfsd with -d and -s options and re-trying the mount from the guest produces nothing in the /var/log/* files and /var/log/nfsd/ is empty. Mounting from the netbook results in a line in /var/log/messages:
mountd[24273]: authenticated mount request from 192.168.168.200:967 for /home/c/d (/home/c/d).
On the basis of this evidence it seems the packets from the guest, intended to initiate the NFS mount, reach the host's NIC but do not reach the host's NFS daemons. I do not know where VirtualBox networking fits within the architecture -- whether Wireshark's showing the packets arriving at the host means they have already traversed VirtualBox networking or not.
How to analyse this problem further?
VirtualBox on the host is PUEL 3.2.8 r64453. There is an unresolved issue on the guest in which boot initialisation of VirtualBox Guest Additions results in
Starting the VirtualBox Guest Additions ...fail!
(modprobe vboxsf failed)
which is a low priority issue because I wasn't planning on using VirtualBox Shared Folders (but might need to as a workaround for the NFS problem!).
Best
Charles
