Sometimes, you may get the \”No buffer space available\” (or similar) error when trying to ping, telnet, ftp or use any other network-related command. In those cases, check out and make sure that you have your local loopback correctly configured:

[nitebirdz@mybox 15779]$ /sbin/ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:90:27:74:87:76
          inet addr:209.181.34.130  Bcast:209.180.20.31  Mask:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1305154 errors:0 dropped:0 overruns:0 frame:0
          TX packets:870553 errors:0 dropped:0 overruns:0 carrier:0
          collisions:34842 txqueuelen:100
          Interrupt:10 Base address:0x1400 

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:3924  Metric:1
          RX packets:72895 errors:0 dropped:0 overruns:0 frame:0
          TX packets:72895 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0