dozens of unsuccessful ping attempts

[IE-TopModel]

Hi!

We own a "3Com® Switch 4200G 24-Port".

Up to recently, it was only used for distributing internet access
to all machines behind our firewall. That works well.

Now those machines shall be allowed to contact each other.

Do we have to change anything in the switch configuration?

If I try to ping from one machine to the other,

it either takes dozens of unsuccessful attempts

until finally the connection is made ...

... or it never happens: 

Request timeout for icmp_seq 1948

Request timeout for icmp_seq 1947
Request timeout for icmp_seq 1948

BTW:

We did not configure anything, just used the initial setup,

and plugged in the firewall, and all of our machines.

Please help.

Thanks a lot!

Greetings from Dublin

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3Com® Switch 4200G 24-Port

http://h10148.www1.hp.com/products/en_US/detail.jsp?sku=3CR17661-91&pathtype=purchase&tab=reqoptprod&jumpid=reg_R1002_USEN

[IE-TopModel]

Have I posted this into the correct subforum?

How can I contact 3com?

It really looks like a bug in that machine, doesn't it?

[IE-TopModel]

This problem is discussed here now:

http://h30499.www3.hp.com/t5/E-Series/4200G-needs-200-attempts-to-route/m-p/2328309

Where is the correct sub-forum for the "3com 4200G" switch?

Thanks!

[IE-TopModel]

I do not know why that link up there stopped working, but this one is working:

http://h30499.www3.hp.com/t5/E-Series/4200G-needs-200-attempts-to-route/m-p/2328309