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No buffer space available

What does the message "No buffer space available" mean and what can i against do?

A part of Deamon-LogFile:
================
2004-Feb  6 03:49:03 firewall named[29719]: master zone "0.0.127.in-addr.arpa" (IN) loaded (serial 1076035741)
2004-Feb  6 03:49:03 firewall named[29719]: listening on [127.0.0.1].53 (lo)
2004-Feb  6 03:49:03 firewall named[29719]: listening on [192.168.1.2].53 (eth0)
2004-Feb  6 03:49:03 firewall named[29719]: Forwarding source address is [0.0.0.0].1060
2004-Feb  6 03:49:03 firewall named[29720]: Ready to answer queries.
2004-Feb  6 03:49:06 firewall pppoe[29323]: send (sendPacket): No buffer space available
2004-Feb  6 03:49:07 firewall pppd[29322]: Modem hangup
2004-Feb  6 03:49:07 firewall pppd[29322]: Connection terminated.
2004-Feb  6 03:49:07 firewall pppd[29322]: Connect time 0.2 minutes.
2004-Feb  6 03:49:07 firewall pppd[29322]: Sent 72805 bytes, received 399 bytes.
2004-Feb  6 03:49:07 firewall pppd[29322]: Exit.
2004-Feb  6 03:49:07 firewall logger: DSL connection time shorter then 60 seconds (13 sec): Error? - wait 900 seconds
2004-Feb  6 03:49:10 firewall named[29720]: ns_forw: sendto([194.25.0.68].53): Network is unreachable

System Interfaces:
============
eth0      Link encap:Ethernet  HWaddr 00:40:95:43:4D:96  
          inet addr:192.168.1.2  Bcast:192.168.1.15  Mask:255.255.255.240
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:124572 errors:0 dropped:0 overruns:0 frame:2648
          TX packets:104921 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:10 Base address:0xec00 

eth1      Link encap:Ethernet  HWaddr 00:00:92:B6:4E:31  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:100650 errors:0 dropped:0 overruns:0 frame:0
          TX packets:120223 errors:0 dropped:0 overruns:0 carrier:0
          collisions:1051 txqueuelen:100 
          Interrupt:11 Base address:0xe800 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2075 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2075 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 

ppp0      Link encap[:P]oint-to-Point Protocol  
          inet addr:80.184.157.90  P-t-P:62.104.190.21  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:100319 errors:0 dropped:0 overruns:0 frame:0
          TX packets:119892 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 

Do you need more infos?

Thanx
Gustav

PS: Is it ok to increase the MTU for ppp0 from 1454 to 1492 [:S]TU .   


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