https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18730#M867 Can be Ip address conflict? Can be wrong default gateway on your computer Can be wrong ARP on your computer for default gateway. Can be that your computer does have two NICs with two routes/gateways. Mon, 04 Apr 2016 10:14:00 GMT Zdeněk_Pala 2016-04-04T10:14:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18729#M866 i have 2 core BD8800 and few summit x450. i have 3 vlans, my summit switches can ping to all different vlans but my host cant ping to different vlans <BR /> <BR /> i have enabled Ip forwarding <BR /> <BR /> from core switch vlan configuration <BR /> -----------------------------------------------------------------------------------------------Name VID Protocol Addr Flags Proto Ports Virtual<BR /> Active router<BR /> /Total<BR /> -----------------------------------------------------------------------------------------------<BR /> AccessControl 20 172.19.0.3 /21 -fL----------v--------------- ANY 1 /3 VR-Default<BR /> CCTV 10 172.18.0.3 /21 -fL---------Tv--------------- ANY 1 /6 VR-Default<BR /> Default 1 172.17.0.3 /21 -fL---------Tv--------------- ANY 3 /155 VR-Default<BR /> ISC 99 172.99.0.2 /30 ------I---------------------- ANY 1 /1 VR-Default<BR /> Mgmt 4095 ------------------------------------------------- ANY 0 /1 VR-Mgmt<BR /> -----------------------------------------------------------------------------------------------<BR /> <BR /> summit edge switches configuration <BR /> <BR /> * X450G2-24p-G4.34 # show vlan-----------------------------------------------------------------------------------------------<BR /> Name VID Protocol Addr Flags Proto Ports Virtual<BR /> Active router<BR /> /Total<BR /> -----------------------------------------------------------------------------------------------<BR /> AccessControl 20 ------------------------------------------------- ANY 0 /0 VR-Default<BR /> CCTV 10 ------------------------------------------------- ANY 1 /1 VR-Default<BR /> Default 1 172.17.4.170 /21 -f----------T---------------- ANY 1 /26 VR-Default<BR /> Mgmt 4095 ------------------------------------------------- ANY 0 /1 VR-Mgmt<BR /> -----------------------------------------------------------------------------------------------<BR /> <BR /> <BR /> Mon, 04 Apr 2016 07:52:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18729#M866 Mohamed_Imran 2016-04-04T07:52:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18730#M867 Can be Ip address conflict? Can be wrong default gateway on your computer Can be wrong ARP on your computer for default gateway. Can be that your computer does have two NICs with two routes/gateways. Mon, 04 Apr 2016 10:14:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18730#M867 Zdeněk_Pala 2016-04-04T10:14:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18731#M868 thanks for your reply . problem was.. my computer .. i was connected to 2 gateways. Mon, 04 Apr 2016 10:19:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/why-host-from-different-vlan-cannot-ping/m-p/18731#M868 Mohamed_Imran 2016-04-04T10:19:00Z