Ping Error

oliverthomson · 12-02-2009, 04:05 AM

Hi All,

I am unable to ping any other machine from my server. I Can't even ping the server to itself. But I can ping the server from any other machine on the network. It gives the following error when I try to ping any machine from the server.

WARNING: probably, rcvbuf is not enough to hold preload

we are using RED HAT ENTERPRISE LINUX AS RELEASE 4 (NAHANT UPDATE 5).
kernel version : 2.6.9-55.ELsmp

Thanks
Oliver

rsashok · 12-02-2009, 06:38 PM

1. How do you ping yourself? (Try to use 127.0.0.1)
2. What is output of 'ifconfig'

oliverthomson · 12-03-2009, 12:34 AM

1. [oracle@cserver 10.2.0]$ ping 127.0.0.1
WARNING: probably, rcvbuf is not enough to hold preload.
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.

2.
[oracle@cserver 10.2.0]$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:19:BB

1:0E:B6
inet addr:172.16.5.102 Bcast:172.16.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1350 Metric:1
RX packets:4057174 errors:25 dropped:0 overruns:0 frame:25
TX packets:698725 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2323370627 (2.1 GiB) TX bytes:53799330 (51.3 MiB)
Interrupt:169 Memory:f8000000-f8012100

qrpengx · 12-04-2009, 03:39 AM

iptables ?

AymanOZ · 12-07-2009, 08:07 AM

Quote:

Originally Posted by qrpengx

iptables ?

Code:

[root@cserver oracle]# iptables -L -vn
 
Chain INPUT (policy ACCEPT 2053K packets, 1929M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
 
Chain OUTPUT (policy ACCEPT 627K packets, 46M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
===
 
[root@cserver oracle]# iptables -L -vn -t nat
 
Chain PREROUTING (policy ACCEPT 62656 packets, 8903K bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
Chain POSTROUTING (policy ACCEPT 4742 packets, 779K bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
Chain OUTPUT (policy ACCEPT 4742 packets, 779K bytes)
 pkts bytes target     prot opt in     out     source               destination
 
====
 
[root@cserver oracle]# iptables -L -vn -t mangle
 
Chain PREROUTING (policy ACCEPT 2057K packets, 1929M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
 
Chain INPUT (policy ACCEPT 2053K packets, 1929M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
 
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
 
Chain OUTPUT (policy ACCEPT 627K packets, 46M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
 
 
Chain POSTROUTING (policy ACCEPT 630K packets, 47M bytes)
 pkts bytes target     prot opt in     out     source               destination
 
===
 
[root@cserver oracle]# iptables -F
[root@cserver oracle]# iptables -F -t mangle
[root@cserver oracle]# iptables -X -t mangle
[root@cserver oracle]# iptables -F -t nat
[root@cserver oracle]# iptables -X -t nat
[root@cserver oracle]# iptables -X
[root@cserver oracle]# iptables -P INPUT   ACCEPT
[root@cserver oracle]# iptables -P FORWARD ACCEPT
[root@cserver oracle]# iptables -P OUTPUT  ACCEPT
[root@cserver oracle]#
 
[root@cserver oracle]# ping cserver
WARNING: probably, rcvbuf is not enough to hold preload.
PING cserver.zomcoit.com (172.16.5.102) 56(84) bytes of data.
--- cserver.zomcoit.com ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 4998ms
 
[root@cserver oracle]#

thePiet · 12-07-2009, 10:08 AM

Hmm, as we can see in https://svn.csail.mit.edu/iputils/br.../ping_common.c, this error occurs when something goes wrong while setting the buffer size for input.

I have no idea why this error should occur, but looking at the above sentence I guess your network is OK (no other issues?) and there is just something wrong with your ping binary or the way it tries to allocate memory.

Just my two cents, shoot me if I'm wrong

arun.n03 · 03-12-2014, 02:43 AM

Same error while pinging : WARNING: probably, rcvbuf is not enough to hold preload.

[root@config1bay10 ~]# iptables -L -vn
Chain INPUT (policy ACCEPT 35M packets, 2907M bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 35M packets, 2952M bytes)
pkts bytes target prot opt in out source destination
[root@config1bay10 ~]# iptables -L -vn -t nat
Chain PREROUTING (policy ACCEPT 2111 packets, 297K bytes)
pkts bytes target prot opt in out source destination

Chain POSTROUTING (policy ACCEPT 18M packets, 1479M bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 18M packets, 1479M bytes)
pkts bytes target prot opt in out source destination
[root@config1bay10 ~]# iptables -L -vn -t mangle
Chain PREROUTING (policy ACCEPT 37M packets, 3073M bytes)
pkts bytes target prot opt in out source destination

Chain INPUT (policy ACCEPT 37M packets, 3073M bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 37M packets, 3121M bytes)
pkts bytes target prot opt in out source destination

Chain POSTROUTING (policy ACCEPT 37M packets, 3121M bytes)
pkts bytes target prot opt in out source destination

iptables -F
iptables -F -t mangle
iptables -X -t mangle
iptables -F -t nat
iptables -X -t nat
iptables -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

Tried all these above commands but still getting the same error :

[root@config1bay10 ~]# ping -S 10.10.2.171 -f -l 1000 10.10.21.74
WARNING: probably, rcvbuf is not enough to hold preload.
PING 10.10.21.74 (10.10.21.74) 56(84) bytes of data.

--- 10.10.21.74 ping statistics ---
544040 packets transmitted, 446777 received, 17% packet loss, time 33049ms
rtt min/avg/max/mdev = 0.001/0.002/0.297/0.001 ms, pipe 1000, ipg/ewma 0.060/0.001 ms

Any solution for this..???

Regards
Arun