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тАО10-26-2004 10:17 AM
тАО10-26-2004 10:17 AM
Routing Issue, 2nd Network
I have three hosts that connect to our internal network (10.10) with no issue. All three hosts have second NICs that need to connect to another network (172.31.4). HostC has been connected for quite a while without issue. I just set up HostA and HostB and all three are now connected to the same switch. The two new hosts communicate fine, but neither will communicate with the original HostA.
I'm really not good at wording networking so there's an attachment for anybody that might want to point me in the right direction.
Basically HOST-A and HOST-B can see eachother without issue, but cannot see HOST-C.
Thanks....
Jim
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тАО10-26-2004 10:29 AM
тАО10-26-2004 10:29 AM
Re: Routing Issue, 2nd Network
When you say "cannot see HOST-C", do you mean not able to ping ?
I dont see any attachment in the post.
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тАО10-26-2004 10:55 AM
тАО10-26-2004 10:55 AM
Re: Routing Issue, 2nd Network
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тАО10-26-2004 11:31 AM
тАО10-26-2004 11:31 AM
Re: Routing Issue, 2nd Network
Sundar: The issue actually goes further, there is a router on the other side of the switch. That is why I made mention of the route statements. I have taken that completely out of the mix and tried to break it down to what appears to be the simplest problem. Right now HostA and HostB can ping eachother, but not HostC. HostC also see's the router on the other side of the switch.
Patrick: The netmasks on the 172 networks are all 255.255.255.0.
Hopefully the attachment goes.
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тАО10-26-2004 11:56 AM
тАО10-26-2004 11:56 AM
Re: Routing Issue, 2nd Network
How about a traceroute to HOST-C from HOSTA/B and post the output ?
Also try a linkloop from HOSTA to HOSTC's MAC address.
I am not really good at networking either..:-) but you can give this a try. Try assigning 172.31.4.20 to lan5 and 10.10.2.103 to lan0 of HOST-C. See if this helps
- Sundar.
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тАО10-26-2004 12:15 PM
тАО10-26-2004 12:15 PM
Re: Routing Issue, 2nd Network
Hmmmmm.... the linkloops HostA-->HostC and HostB-->HostC are failing too.
I don't think it's the cables because HostA and HostB communicate. Also, HostC communicates out thru thru the router.
It's a simple 3com 5-port switch so there's no port programming involved. All lights are green.
I can't take down any of the 10.10 adapters because they are production. I am going to try to changing the 172 network addresses and see what happens.
Jim
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тАО10-26-2004 12:27 PM
тАО10-26-2004 12:27 PM
Re: Routing Issue, 2nd Network
why does that not show the route as 10.10.0.0, - as it does for host A and B?
- John
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тАО10-27-2004 01:13 PM
тАО10-27-2004 01:13 PM
Re: Routing Issue, 2nd Network
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тАО10-27-2004 04:13 PM
тАО10-27-2004 04:13 PM
Re: Routing Issue, 2nd Network
Obviously your 10.10 network is fine. All three nodes can see each other through 10.10 network and also the router.
It looks like the cable/switch port where HOSTC's lan1 has been plugged into has a problem since linkloop is not working. What kind of interfaces are on HostA and HostB?. I see HostC is using built-in interface which is 10MB. Check if the speed on the switch port is not set to 100 Full Duplex.
-Sri
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тАО10-27-2004 05:58 PM
тАО10-27-2004 05:58 PM
Re: Routing Issue, 2nd Network
Everything definitely would point towards a port issue with HostC except that the host is the only one that actually see's thru the switch and router to the other network. It is the one host doing what I want. It is a 10mb card as you mentioned, it is a pretty old card. Sorry I don't have model numbers. The cards on HostA/B are fairly new hardware. They are both set at 100FD. I have changed each of them to 10HD and 10FD in an attempt to see if that would help.
When I run lanadmin -x on HostC it tells me it isn't supported.
The switch itself is a basic 3COM 5-port switch, so I'll try replacing that and testing any other ideas Saturday morning when I can take down the NICs.
Providing I survive the Red Sox parade!!
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