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Old 11-02-2006, 05:58 AM   #1
Registered: Jun 2005
Location: London, Uk
Distribution: RH-ES 3/4, FC 5/6
Posts: 51

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Blades can't ping eachother!?

I have 9 blades in a bladecenter chassis, each of the blades is configured to use eth0 as an external interface (via the switch in module bay 1) & this works without fault across all blades.

They are also configured to use eth1 as a local/private interface for the purpose of management, and are wired through the switch in module bay 2, which is connected to a private network (10.0.0.x/ I understand this is incorrect netmask but I didn't set it up).

However, 3 of the blades will not communicate across the private network (eg eth1, switch bay 2), while the others will ping blades in the same chassis across this interface - but cannot ping other 10.0.0.x machines outside the blade chassis.

I have compared the route tables, IP configuration, & firewall settings of those that will ping other blades, & those that won't, and can see no difference. What else should I look at? I tried to arping & got a response between 2 blades that wont ping eachother - can any useful conclusions be drawn from that?

The switches in module bays 1 & 2 also appear to be identical in setup - eg default setup, no VLAN's defined etc. My primary aim is to at least get machines inside the chassis pinging eachother this week, & tackle the larger issue of why none of the blades are reachable from outside the chassis, on interface eth1/switch2 later.

Thanks in advance for reading & any help you can provide, I will try to provide some log/config files if requested.

ttfn, Jim
Old 11-03-2006, 06:13 PM   #2
Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
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what switch modules are they? we use the Nortel L2/3 GbESM's with really good success. one thing i might point towards was some general confusion over the naming order of the nics. i *think* sometimes some linux installs picked the cards up backwards, so eth0 was actually eth1 etc... things that would certainly help here are things like arp tables on each affected box... can you see the mac addresses listed there? if yes, then it may well be a firewall issue etc, if not, possibly more physical or siwtch related. could also help to prove masks and ip addressing is valid across these boxes.

and the mask isn't technically wrong at all, it's perfectly legal, just not particuarly comon these days as most subnets only hold 254 hosts whereas that mask could put up to 63553 (ish) machines on one flat subnet. that's one BIG arp table...!
Old 11-06-2006, 04:29 AM   #3
Registered: Jun 2005
Location: London, Uk
Distribution: RH-ES 3/4, FC 5/6
Posts: 51

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Thanks very much for your reply acid_kewpie - appreciate it The modules are the intel IXM5414 4 port (not sure who manufactures these), I swapped the one on site for one that we had in the office; lo & behold, all blades can now ping eachother across the private 10.x.x.x network, and boxes outside the chassis. I think we'll upgrade the switches to the new 6 port models soon.

We've got issues with the management modules behaving strangely now...if we ping -t a module you get a response for perhaps 30 seconds, then timeout for 40 secs, then it starts responding again?! Thus the web interface is unusable currently. Tried a couple of hubs/switches & it behaves the same. Perhaps that's another thread tho' Thanks again for your help.


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