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04-28-2011 03:24 AM
04-28-2011 03:24 AM
vlan routing duplicate pings
If I ping to one of our location from our new VLAN99 I always get duplicate pings:
64 bytes from 10.44.9.51: icmp_seq=0 ttl=252 time=25.934 ms
64 bytes from 10.44.9.51: icmp_seq=0 ttl=252 time=25.939 ms (DUP!)
....
The traffic goes to a Cisco Router which is connected to the 5500G and is untagged member of VLAN1 and VLAN99. This is the way the packet goes:
4200G:
VLAN1: vlan-interface1 129.201.3.6, 255.255.0.0
Port 1,2 untagged member of VLAN1 and tagged member of VLAN99, trunk
Client Ports are untagged member of VLAN1 and VLAN99 and have PVID 99
5500G:
VLAN1: vlan-interface1 129.201.3.1, 255.255.0.0
VLAN99: vlan-interface99 10.11.3.1, 255.255.0.0
Port 1,2 untagged member of VLAN1 and tagged member of VLAN99, trunk
Default Gateway: 129.201.3.50
Cisco Router Network Settings:
129.201.3.50 AND 10.11.3.50 on the same network interface
connected to the 5500G, port hybrid, untagged member of VLAN1 and VLAN99
Client Network Settings:
IP-Address: 10.11.8.1, 255.255.0.0
Default Gateway: 10.11.3.1
The 5500G acts as a router and if I ping from a Macintosh I'll get duplicate pings but from a PC all pings are OK. This looks pretty weird to me because the PC has the same configuration as the Mac and I don't know if this is a Mac specific problem or there is something wrong with the configuration of the VLAN or maybe something else. Any help would be much appreciated!!!
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05-02-2011 01:20 PM
05-02-2011 01:20 PM
Re: vlan routing duplicate pings
Hi
Hard to see the issue. the best way is to use a network sniffer (i.e. wireshark) and see where the to response come from.
By the way: Windows ping ignors the second response :-) ... but you should see it on wireshark
br
Manuel