Strange Network Performance

[Thomas M. Skeren III]

I have 6 5.3 and 3 5.4 for servers.  The servers provide Samba/LDAP, 
DHCP,  Natting, IPSec (for vlan tunnels).

One, and only one server behaves very oddly.  If I do a transfer to the 
other BSD server there (LDAP Master and DNS), I get full wire speed:

tp> 150 Opening BINARY mode data connection for 'open.tar.bz2'.
ftp>  66% 
|*****************************************************************************                                        
|   355 MB    7.56 MB/s
ftp>

However when I issue a get command I get this:

ftp> get open.tar.bz2
local: open.tar.bz2 remote: open.tar.bz2
229 Entering Extended Passive Mode (|||61238|)
150 Opening BINARY mode data connection for 'open.tar.bz2' (557269784 
bytes).
  0% 
|                                                                                                                     
|  2849 KB  105.55 KB/s  1:25:28 ETA

The data transfer rate is about 93.5% of these speeds for smb 
transfers.  No other server exhibits this behavior.  I'm really puzzeled.

Here's an ifconfig -a:

camarillo# ifconfig -a
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=b<RXCSUM,TXCSUM,VLAN_MTU>
        inet xx.xx.xx.xx netmask 0xfffffff8 broadcast xx.xx.xx.xx
        inet6 xxxxxxxxxxxxxxx%fxp0 prefixlen 64 scopeid 0x1
        ether 00:0e:0c:50:b1:fa
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
        inet6 fe80::214:85ff:fe14:92b7%sk0 prefixlen 64 scopeid 0x2
        ether 00:14:85:14:92:b7
        media: Ethernet autoselect (100baseTX <full-duplex,flag0,flag1>)
        status: active
plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
        tunnel inet xx.xx.xx.xx --> xx.xx.xx.xx
        inet6 xxxxxxxxxxxxxxxgif0 prefixlen 64 scopeid 0x5
        inet 192.168.0.1 --> 192.168.64.1 netmask 0xffffff00
camarillo#                                          

Any suggestions as to wtf is up would be appreciated.

TMS III