Ping In Vlans Not Working?
Aug 10, 2008
I have two servers both in a same vlan. Both may access Internet and be acceessed from Internet I setup db server and web server internal IP each as follows:
step 1: on web server:
vi /etc/sysconfig/network-scripts/ifcfg-eth0:0
add following:
DEVICE=eth0:0
BOOTPROTO=static
BROADCAST=192.168.1.255
IPADDR=192.168.1.5
NETMASK=255.255.255.248
NETWORK=192.168.1.0/24
ONBOOT=yes
TYPE=Ethernet
save and /etc/init.d/network restart
step 2: on db server:
vi /etc/sysconfig/network-scripts/ifcfg-eth0:0
add following:
DEVICE=eth0:0
BOOTPROTO=static
BROADCAST=192.168.1.255
IPADDR=192.168.1.10
NETMASK=255.255.255.248
NETWORK=192.168.1.0/24
ONBOOT=yes
TYPE=Ethernet
save and /etc/init.d/network restart
I used ifconfig to check both status, both of them are up. both of them may ping google, but when I try to ping their each other through internal IP, nothing returns.
I used command tracert to follow, found all packages were sent to Internet rather than an internal IP.
My host tells me to do it by making NAT, I have no idea on it. Anyone may help me out on how to do with NAT?
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Nov 2, 2008
15ms ping vs 40ms ping vs 170ms ping
Which you think is still acceptable for a website?
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Nov 5, 2008
how to add different IPs in different VLANs
My customer requests different IPs in different class C, that are belong to different VLANs in the switch. Let's say
- they have 1.1.1.10 already on their server with gateway value is 1.1.1.1
- now they want to have 1.1.2.10 too.
I have no trouble to provide them a new IP, but wonder how to setup on server now? Different range will use different gateways.
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Apr 16, 2009
Is there a VPS provider that will sell me a VM , and put it up somewhere, and can make me another VM in the future, on the same VLAN as the original VM ?
For example, pretend VM #1 has a NIC at 10.0.0.100
in the future, I want another VM with a nic at 10.0.0.101
I was looking at Go-Grid , but I'm not sure how their pricing works.
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Sep 5, 2006
I need a basic L3 switch for maybe 25 mbps that will do hopefully up to 50 VLANs and which will not require me to hire someone to configure it.
As much as I like Cisco, that rules them out.
The reason I'd like a Layer 3 switch is so that I can run my backups and inter-server transfers without adding to my bandwidth bill. Also, VLANS are a critical requirement as i have a lot of customers with root on their managed servers.
So i am looking at HP [gasp] switches. How "easy" is the web-based configuration widget? [I'm an advanced unix admin but networking is a mystery to me.]
This is a starter switch and once i have a full cab of servers I'll be able to spend $7K on a pair of 3560s and hire someone to configure them for me ... but until then what can i get to meet my requirements?
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Sep 22, 2009
My switch 3COM 4500 (Layer3) ;
I want port 1 of switch work in all VLANS!
I created vlan2, vlan3 and add this trunk/hybrid port in all vlans and ping no work por port1.
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Jul 13, 2009
I orded today new switch 3COM (48 port + 2giga + 2 fiber).
In WebPanel i created:
vlan2: port1 - port 20
vlan3: port21 - port40
I want configure switch for port 41-48 access all ports;
What solution for this cenary?
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Feb 11, 2007
I'm trying to implement VLANs on my network and can't get connectivity to host servers. Here's how the network is configured. Pardon the bad ascii diagram.
In this example my upstream is providing two subnets:
111.111.111.16/28 (I'm using an IP from this subnet to manage the 3550)
222.222.222.16/29
I am attempting subdivide the /29 into two /30's in order to place a server into it's own /30 subnet & VLAN ............
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Jul 24, 2007
What's the benefits of these private VLANs I've seen advertised around? Anyone have a good understanding?
I've read a few things about them but have yet to fully grasp the concept.
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Dec 4, 2006
I'm not sure exactly how to phrase the question. But, I'm researching how to PXE boot a server without having a DHCP/PXE server in each vlan.
Scenario: Datacenter with dozens of servers. 1 VLAN per server. Cisco switches and routers. Each server has a serial console available for remote management (OS and BIOS are configured for serial console). If an admin wants to re-install OS, they should be able to reboot the server and tell the BIOS to initiate a PXE boot request. A central install server is available to provide the DHCP and PXE boot images.
Has anyone tried this? I have been reading about the 'ip helper-address' for Cisco to relay DHCP requests. Interested in hearing about real-world setups. Or is there a better way to accomplish remote OS installs?
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Aug 8, 2008
we are looking for a provider that provides public ip vlans' with dedicated server purchases,
so far,,
we have found few companies that offer this at no extra charge or minimal extra charge
1) softlayer (best choice)
2) singlehop
3) nocster/burst.net (not a good provider for business hosting / not reliable / no phone support)
does anyone know of any other dedicated server providers that offer public ip vlans for no extra charge or minimal extra charge?
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Jun 9, 2007
I'm looking for a solution that I can place a firewall between 2 vlans on
a BigIron router with L3 enabled.
For this moment there is one big vlan2 with a ip-route 0.0.0.0 0.0.0.0
123.123.123.123 and a router-interface ve2 with the IP of the router, the
address I use as gateway on the machines behind it.
The WAN port has the IP address to communicate with to the GW of the
carrier-router (123.123.123.122)
Because I want to let the BigIron the routing I was thinking of 2 vlans,
one for the lan-vlan and one for the wan-vlan, but this will be a problem
because I only have one IP-block what I can use.
So the sitiuation must be as follow on the BigIron:
WAN => vlan2 => firewall => vlan3(lan)
Because of the fact that the firewall will be transparent, this should be
no problem to place it between the vlans. The actual problem is how to
manage this. In simple words, I should be able to replace the firewall
with a cross-cable and it should still work.
Cisco for an example has a SVI solution for this, but I can't find such
thing for a Foundry router.
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Feb 13, 2007
Having a slight problem working with one of our Extreme Summit 48 (ugh) switches - I've figured out most of the basics, but I can't seem to find any way to add a secondary IP address to a VLAN! This, I would have thought, would be a pretty basic feature to have. Typing "config vlan [vlanname] ipaddress 1.2.3.4/24" works for setting the primary IP, but I can't figure out how to add any more - and doing the command again just overwrites the first one.
So... does anyone have any tricks up their sleeve, or is this something that Extreme neglected to add to this model switch?
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May 22, 2008
We offer colocation & dedicated servers as well as shared & reseller hosting services.
Our colocation customers and dedicated server customers are definitely on their own VLANs for obvious reasons.
Up until now, we have been using separate VLANS and ip allocations for each of the servers in our shared & reseller server fleet. I'm starting to question this policy for many reasons:
1) We directly manage all of the servers and it is very rare that any servers are compromised to the point where they can steal an IP address.
2) We are wasting IP addresses - network, broadcast and gateway addresses are required for each vlan. Additionally, if a server needs 1 more IP address, we need to add a whole new block.
If all of the servers are under our direct management, does it make sense for us to use any vlans at all? It seems that it only serves to complicate things, waste ips and add management overhead.
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Sep 19, 2009
I've read that all ethernet switches in a MST Region need the same Name, Revision number, and list of member vlans for each Instance. So what happens when you need to change the range of VLANs in a MSTI ? Let's say that you need to add a range of vlans to an instance that spans 20 switches? How would you do that?
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Oct 11, 2009
Can you make a recommendation for a switch-based L3 router which can
- hold a moderate number of routes (interface routes, a few hundred statics + default)
- OSPF and BGP
- MST
- 1024 layer-3 dot1q subinterfaces (or maybe VLAN interfaces)
with
+ traffic policing in and out per subinterface/vlan
+ VRRP/HSRP/NSRP
- IPv4 & IPv6 native
- 2x GigE ports
- Not tip-over under 1gbps DDoS towards a VLAN interface.
I've been using 3560Gs, but they seem to lack the output traffic policing. I'd prefer to have subinterfaces which don't run spanning-tree, versus Vlan Interfaces to a trunk interface which runs spanning-tree. These switches sit at the L3 boundary between two L2 networks.
Cost is a big factor; but I also must carry vendor licenses & support contract, if the vendor asserts that not doing so is illegal in US.
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Apr 24, 2008
I have a domain with a few forwarding email accounts that forward to mac.com email accounts... for some reason every once in a while these accounts stop working...
This is the error I get when I email to that account:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed: ...
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Jun 6, 2008
My server DC technician change the cable to another switch in another rack. all in sudden, my server went 'offline'.
the weird thing is,
I can ping the server IP
When I plug my KVM,
I can ping google.com from my server
But when I lynx google.com, it keep saying
HTTP requests sent; waiting for response._
When I open my putty and SSH, it keep waiting.
When I try to ssh from another server, it keep waiting
$ ssh school@xxx.xxx.xxx.xx
[nothing happen]
$ ping xxx.xxx.xxx.xx
PING xxx.xxx.xxx.xx (xxx.xxx.xxx.xx) 56(84) bytes of data.
64 bytes from xxx.xxx.xxx.xx: icmp_seq=1 ttl=63 time=1.10 ms
64 bytes from xxx.xxx.xxx.xx: icmp_seq=2 ttl=63 time=0.864 ms
64 bytes from xxx.xxx.xxx.xx: icmp_seq=3 ttl=63 time=0.854 ms
- I can ping my server from MS DOS
- I can ping my server from Iptools.com
- I can ping my server from another server
But..
- I cannot ssh into my server
- I cannot ssh into my server from another server
Inside my server..
- I can ping google.com, yahoo.com, other servers
- But I cannot lynx and open all websites
When I restart network, it shows [refer attachment] captured from my KVM
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Oct 23, 2008
PING
Whats that?
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Feb 5, 2007
after my server down, i ask for reboot then the server up again.
but i cant access SSH via my main ip, but i can access SSH via second ip. when i ping main ip, all is request time, but my second ip can ping.
ok main ip cannot use, so i use second ip the main problem come i cant do yum update kernel, will show this error
Quote:
Setting up Update Process
Setting up repositories
Cannot find a valid baseurl for repo: update
Error: Cannot find a valid baseurl for repo: update
when i try run socks5 proxy in my server, it running, but when i use it for my personal pc, the socks5 it not run....just show proxy is offline.
when i do wget some direct links
it always show, but never download
Quote:
[root@xxxx ~]# wget ftp://ftp.is.co.za/mirror/centos/4.4...4E.12.i386.rpm
--11:39:24-- ftp://ftp.is.co.za/mirror/centos/4.4...4E.12.i386.rpm
=> `squid-2.5.STABLE6-3.4E.12.i386.rpm'
Resolving ftp.is.co.za...
so i try to go check resolv.conf, but don have problem, my other 2 same server also dont have problem with this dns server.
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Jan 13, 2007
I just moved from PowerVPS to EuroVPS, being located in Europe myself, and was of course hoping for much better ping times. Also EuroVPS advertise themselves with a 30ms ping to most of Europe.
Anyway after my VPS was installed I compared the pings:EuroVPS (85.17.48.162) average ping: 335ms
PowerVPS (69.65.106.19) average ping: 129ms
335ms is of course ridiculously high, and after writing them a support ticket they told me it's probably a latency problem with my ISP
Can you please post the ping you get for 85.17.48.162 (preferably people located in Europe)?
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Mar 25, 2009
I have configured Nagios on my network 10+ Servers (Linux+Windows) now when i check through http://localhost/nagios everything is ok but only ping command is giving following message :-
Unknown
bin/ping -n -U -w 10 -c 5 x.x.x.x
CRITICAL - Could not interpret output from ping command
and mail me "server down " message
So what is the issue ?
I am able to run this command through command line
./check_ping -H {server} -w 100.0,20% -c 500,50% -p 5
PING OK - Packet loss = 0%
./check_ping -H x.x.x.x -w 300.0,80% -c 500.0,100% -p 5
PING OK - Packet loss = 0%
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Jul 13, 2008
I'm running my own OpenVZ server with a few VPS's running on it and have a small network issue.
I can't ping any VE from the HN. All the other networking is working ok (strangely I can ping the HN from the VE) apart from this. It's a simple setup with one network card connected to the internet.
OpenVZ the latest stable version running on CentOS 5.2
I'm pretty sure it's not a firewall problem but is something to do with arp or routing and one of the settings in sysctl.conf
Has anyone else seen this?
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Feb 10, 2009
Does it matter?
I did a few tests
Pinging lunarpages.com [74.50.4.210] with 32 bytes of data:
Average = 191ms
Pinging hostmonster.com [74.220.195.150] with 32 bytes of data:
Average = 191ms
Pinging godaddy.com [97.74.104.201] with 32 bytes of data:
Average = 175ms
Pinging rackspace.com [72.32.191.88] with 32 bytes of data:
Average = 150ms
Pinging siteground.com [209.85.102.36] with 32 bytes of data:
Average = 148ms
Pinging hostgator.com [74.54.219.185] with 32 bytes of data:
Average = 147ms
Pinging ipowerweb.com [66.96.130.200] with 32 bytes of data:
Average = 113ms
The pages load really fast @ ipowerweb
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May 5, 2009
i've only ever used pings to test if a host is up or down.
But what other information am i looking for in ping tests. For e.g., the time in ms the TTL etc etc?
How can i test pinging my server from different locations around the world?
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Jul 8, 2008
i install one xen guest ( centos5)
i run yum update and result is :
-bash-3.1# yum update
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
Could not retrieve mirrorlist http://mirrorlist.centos.org/?releas...86&repo=extras error was
[Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Error: Cannot find a valid baseurl for repo: extras
i use of middle config :
/etc/sysconfig/network-scripts/ifcfg-eth0 TYPE=Ethernet
DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.13
IPV6ADDR=
IPV6PREFIX=
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=myhost.l3i.ca
GATEWAY=192.168.0.1 /etc/resolv.conf (DNS resolver)
nameserver 4.2.2.1
nameserver 4.2.2.2
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Jul 23, 2008
My sites are up when I go to http and there is no slowdown but my monitors (panopta and pingdom) say that there is an outage in ping (only in ping, http is up). I tried pinging the server and there are packet loss up to 100% but the site is still up. I also used other online pinging tools (all-nettools.com, dnsstuff.com, etc.) and host unreachable.
I tried contacting the provider but they say there are no network problem at this time. So I found this other site that's also hosted on the same provider and I can access their site but fails on ping.
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Jul 26, 2008
My server ping keeps disconnecting
However my ssh & website is smooth running!
When i type "service iptables stop", the ping runs just smoothly.
I have CSF installed in the server, like any other server using default configurations. I believe it has something to do with selinux? (or not?)
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Oct 26, 2008
i think 216.245.208.x and 216.245.215.x DOWN, but limestonenetworks tell me :"problems well outside of our network, and I would highly suggest contacting your ISP for support on this matter" ....
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May 27, 2007
Must an IP address have to be pingable for apache to be seen.
I've set up an apache server at home and I noticed that if I block ping requests, no one can see i externally.
If I enable ping requests people can visit my site/server.
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Mar 11, 2007
I have 2 CPanel servers. I wanted to transfer multiple accounts via WHM but it gives me error that I cannot SSH into the other server.
I tried to ping the 2nd server from 1st server and it gives me:
root@s [~]# ping xxx.xxx.xxx.7
PING xxx.xxx.xxx.7 (xxx.xxx.xxx.7) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
cping: sendmsg: Operation not permitted
I added both server IP into allowed list inside my APF firewall on each server as well.
I rebooted both server earlier before, but it is still not solving my problem.
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