search for: ping's

i am hoping this attachment gets through. It deals with bug in ping that made it very difficult to set up a system with two gateways. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20091009/ddfc8176/attachment-0004.html&...

Hi all, I've recently switched to the latest rt kernel available from http://people.centos.org/hughesjr/kernel-rt And one of the two problems I'm having with this new kernel is that the logs have been flooded with nagios alerts which indicate high percentage (50-60) of packet loss when pinging localhost. The problem shows up several hours after the system reboot. Any ideas on what might be wrong and how to fix this on a running system? Are there any current plans to integrate MRG Realtime into CentOS project? Thank you, Sasha

At Rusty's suggestion, I tested vhost base performance with ping. Results below, and seem to be what you'd expect. I'm working on TSO support, expect results shortly. latency with ping (lower is better): native: [root at virtlab17 ~]# ping -c 1000000 -f -q 21.1.50.4 PING 21.1.50.4 (21.1.50.4) 56(84) bytes of data. --- 21.1.50.4 ping statistics ---...

At Rusty's suggestion, I tested vhost base performance with ping. Results below, and seem to be what you'd expect. I'm working on TSO support, expect results shortly. latency with ping (lower is better): native: [root at virtlab17 ~]# ping -c 1000000 -f -q 21.1.50.4 PING 21.1.50.4 (21.1.50.4) 56(84) bytes of data. --- 21.1.50.4 ping statistics ---...

...elp. I have a leased line on 83.111.160.6 (/30 subnet, gw is 83.111.160.5), and they route an additional block 83.111.196.56/29 (83.111.196.57 to 83.111.196.62 useable) over the link. I have a Debian box, and the routed block IP?s are setup as aliases. I have setup the box to accept ssh and ping for each IP alias. /etc/network/interfaces auto eth3 iface eth3 inet static address 83.111.160.6 netmask 255.255.255.252 up ip addr add 83.111.196.57/29 brd 83.111.196.63 dev eth3 label eth3:0 up ip addr add 83.111.196.58/29 brd 83.111.196.63 dev eth3 label eth3:1 up ip addr add 83.111.19...

Hello! I have two problems. One is, that I cannot ping a DomU from Dom0 (or any other host in my local network) and the second one is, that I cannot ping the same site (eg. www.suse.com) from two DomU''s at the same time. I have a fresh installation of openSuse 11.0 with Kernel 2.6.25.20-0.1-xen and my box has two physical ethernet cards. As...

I have a simple perl script that every few hours pings the handful of machines on my LAN. Lately I've sometimes been getting ping of 192.168.0.1 succeeded ping of 192.168.0.7 succeeded ping of 192.168.0.5 FAILED ping of 192.168.0.6 succeeded ping of 192.168.0.9 succeeded This machine in question has been running Centos faithfully for about six...

http://pastebin.com/raw.php?i=rykHdvBh bix.hu and www.yahoo.com are "pingable" test sites. 127.0.0.1 could not be pinged [firewall drops all icmp] i have a "oneliner" that echoes if theres "internet connection or no". $ ping -W 1 -c 2 bix.hu &gt;&amp; /dev/null &amp;&amp; ping -W 1 -c 2 www.yahoo.com &gt;&amp; /dev/null &...

Hi, I''ve installed xen 3.0.3 from packages (xen-linux-system) on a debian etch, and i''ve configured it with network-bridge script in the default way (netdev=eth0, bridge=xenbr0, etc...) which is ok for me. the problem I have: I cannot ping any outer machine from dom0 (nor any outer machine can ping me). It gives me a "Destination Host Unreachable" message that makes me think there is no arp response. other symptoms: I can ping from dom0 any domU''s I create... ... and from those domU''s I can ping...

Hi, There seems to be a problem with the timer resolution on x86_64. This is clear in ping results - I don't know if it's just a ping problem or if it manifests elsewhere as well. It does also affect mtr and traceroute times. I guess it's more a kernel issue than a CentOS problem, but is anyone else seeing the same? Ping results have a resolution of 10ms - so a ping <...

Hi, Greg, Eddie, I found that in SR-IOV + HVM environment, ping latency depends on ping interval. The NIC is Intel 82576 (1000Mbps), server uses xen-4.0.1, domain-0 is kernel-2.6.32 and HVM is kernel-2.6.31. The server and client are connected through a 1000Mbps switch. The data is as following: # ping -i 1 192.168.0.21 PING 192.168.0.21 (192.168.0.21) 56(8...

I just got an inexpensive VPS too have an outside server to play/test with. I am pinging it every 5 minutes and graphing with MRTG on another CentOS box. This works fine to all servers but the VPS. The first ping to the VPS is always crud and following ones are fine. [root at ns1 scripts]# ping X PING X 56(84) bytes of data. 64 bytes from X: icmp_seq=1 ttl=55 time=773 ms 64 bytes...

For a same configuration in which the default policy is drop and only one connection is accepted in rules, continuous pinging to devices will stop squarely in 4.0.15 as soon as a very basic firewall is enabled whereas in 4.4.26.1, pinging will still continue after the firewall is enabled. All tests are done with proper reboot of the unit3 where the firewall is applied: unit1 <---> eth4 unit3 eth1 <---&...

Hello Samba folks, I thought you might be able to help me. I have 2 machines, 1 is FreeBSD, 1 is win95. They can't ping each other, but the bsd box comes up in Network Nieghborhood when Samba is active. What's going on? Is it not possible to ping a windows machine from a unix box? They are on the same hub via UTP. IPs are 192.168.1.x and netmasks are same (255.255.255.0). No ipfw or routed running. Does anyo...

hi, how to write a scripts which launches 10 pings to different destinations at execution of single shell scripts please help me any ideas regards, Gopinath

Hi all, One of the net-ping users reported that the Net::Ping::External library was returning false positives on Vista. Basically, it does a ''ping -n1 host'' and checks for certain error strings. The problem is that the error strings it checks for are in English. The user in question is using a cmd.exe th...

We're being ping-flooded by the Nachi worm, which probes subnets for systems to attack by sending 92-byte ping packets. Unfortunately, IPFW doesn't seem to have the ability to filter packets by length. Assuming that I stick with IPFW, what's the best way to stem the tide? --Brett Glass

...5.255.255.0 machine 2 eth0 Link encap:Ethernet HWaddr 00:14:2A:69:4C:47 inet addr:10.54.7.3 Bcast:10.54.7.255 Mask:255.255.255.0 eth1 Link encap:Ethernet HWaddr 00:11:50:9B:A5:0A inet addr:10.54.0.3 Bcast:10.54.0.255 Mask:255.255.255.0 machine 1 & 2 can ping each other on either subnets machine 3 (windows)... C:\>ipconfig Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 10.54.7.16 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.54.7.1 cant ping anyth...

...ether 00:16:3e:34:72:85 brd ff:ff:ff:ff:ff:ff inet 192.168.130.172/24 brd 192.168.130.255 scope global eth0 inet6 fe80::216:3eff:fe34:7285/64 scope link valid_lft forever preferred_lft forever 3: sit0: <NOARP> mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0 sles10mini:~ # Ping dom1 from localhost: foobar:~ # ping 192.168.130.171 PING 192.168.130.171 (192.168.130.171) 56(84) bytes of data. From 192.168.130.170: icmp_seq=1 Destination Host Unreachable From 192.168.130.170 icmp_seq=1 Destination Host Unreachable From 192.168.130.170 icmp_seq=2 Destination Host Unreachable...

...ess allowed per port). A subnet is routed to the dom0, which then knows which addresses the domUs have. The problem is that every first packet between a domU and a host not in the arp cache has a very high delay. This is protocol independent (happens for http and dns too) but I''ll provide ping as an example: Route in domU: -------------- $ ip route default dev eth0 scope link Ping from domU to remote host: ------------------------------ $ ping 1.2.3.4 PING 1.2.3.4 (1.2.3.4) 56(84) bytes of data. 64 bytes from 1.2.3.4: icmp_seq=1 ttl=54 time=304 ms 64 bytes from 1.2.3.4: icmp_seq=2...