Setting up a test lab and ran into a weird NFS mounting problem:
[7.2-STABLE FreeBSD 7.2-STABLE #0: Tue Jun 2 12:02:57 MDT 2009]
denver:#ifconfig fxp0|grep inet
inet 172.20.6.15 netmask 0xffffff00 broadcast 172.20.6.255
inet 116.123.45.215 netmask 0xffffff00 broadcast 116.123.45.255
denver:#grep cherno /etc/hosts
172.20.6.210 cherno
116.123.45.210 cherno
denver:#ping -c1 cherno
PING cherno (172.20.6.210): 56 data bytes
64 bytes from 172.20.6.210: icmp_seq=0 ttl=64 time=0.363 ms
denver:#showmount -e 172.20.6.210|wc -l
8
denver:#showmount cherno|wc -l
^Cdenver:#
it fails to 'showmount' via hostname.
On the NFS Server/on cherno::
10. 014455 00:02:b3:89:82:6e > 00:b0:d0:79:f0:e0, ethertype IPv4 (0x0800),
length 98: 116.123.45.215.994 > 116.123.45.210.111: UDP, length 56
Why is it trying to use the other IP/entry from the hosts file?
Now, if I remove the "public" ip from the interface:
denver:#ifconfig fxp0 -alias 116.123.45.215
denver:#showmount -e cherno|wc -l
8
Then if I add another subnet to fxp0 it still works:
denver:#ifconfig fxp0 alias 116.123.45.15/24
denver:#showmount -e cherno|wc -l
8
Then it fails again:
denver:#ifconfig fxp0 -alias 116.123.45.15
denver:#ifconfig fxp0 alias 116.123.45.215/24
denver:#showmount -e cherno|wc -l
^Cdenver:#
Now uncomment the public IP from /etc/hosts:
denver:#grep cherno /etc/hosts
172.20.6.210 cherno
#116.123.45.210 cherno
it still has the 'evil' public ip:
denver:#ifconfig fxp0|grep inet
inet 172.20.6.15 netmask 0xffffff00 broadcast 172.20.6.255
inet 116.123.45.215 netmask 0xffffff00 broadcast 116.123.45.255
denver:#showmount -e cherno|wc -l
8
denver:#netstat -rna
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
127.0.0.1 127.0.0.1 UH 0 522 lo0
172.20.6.0/24 link#2 UC 0 0 fxp0
172.20.6.210 00:b0:d0:79:f0:e0 UHLW 1 31 fxp0 569
172.20.6.213 00:03:47:e8:4e:11 UHLW 1 1264 fxp0 91
116.123.45.0/24 link#2 UC 0 0 fxp0
116.123.45.210 00:b0:d0:79:f0:e0 UHLW 1 1 fxp0 1136
It seems if the alias IP on fxp0 is from 116.123.45.192 -> 223 it fails,
and does not even try to use the 172.20.6.X...
ssh/ping/file server/ftp/etc - Everything else works fine using /etc/hosts
and from there it is using the 172.20.6.X network, only NFS wants to use
the 116 network....
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