Ping between VLANs only works one-way, except for Gateway

jseley002 · ‎12-09-2015

Hi all,

I am currently experiencing an issue with communication between VLANs with devices connected to the same L3 switch.

VLANs are configured as follows:

Vlan 5

Interface VLAN 5

IP Address 192.168.5.1 255.255.255.0

Vlan 6

Interface VLAN 6

IP Address 192.168.6.1 255.255.255.0

Vlan 8

Interface VLAN 8

IP Address 192.168.8.1 255.255.255.0

Routing is configured as:

Router eigrp 10

network 192.168.0.0 255.255.0.0 (no auto-summary and network 192.168.5.0 255.255.255.0, 192.168.6.0 255.255.255.0, and 192.168.8.0 255.255.255.0)

IP Routing is enabled

VLAN 8/192.168.8.x subnet can ping all IPs on VLAN 5, 6 & 8

VLAN 6/192.168.6.x subnet can ping all IPs on VLAN 5 & 6, but only the gateway IP on VLAN 8 (not any other IPs, e.g. the device configured with IP address 192.168.8.2 and /24 mask.

Source pings on the switch from 192.168.6.1 or the PC connected on 192.168.6.2 can ping 192.168.5.1, 192.168.5.2, and 192.168.8.1, but not 192.168.8.2. Pings sourced from 192.168.8.1 or 192.168.8.2 can ping 192.168.5.1, 192.168.5.2, 192.168.6.1 and 192.168.6.2.

What's preventing pings from working in one direction between VLANs???

mohammed chalil · ‎12-12-2015

Hi,

Try swapping the 8.0 hosts to other vlans. if you are still not able to ping to these hosts then it might be an issue with the firewall policies on the host.

Rgds

jseley002 · ‎12-14-2015

The only VLANs that work correctly are 5 and 6, any others don't work. I can ping the device on VLAN 8 from the switch from the gateway ip address configured on VLAN 8, but when pinging it from the gateway IP for VLANs 5 or 6 it doesn't complete (so I don't think it's a firewall issue on the host).

Thanks!

jseley002 · ‎12-14-2015

To further clarify, I can also ping the VLAN 8 gateway IP from the VLAN 5 and VLAN 6 gateway IP's as well.

Masoud Pourshabanian · ‎12-13-2015

Hello,

Do you have any access-list on interface VLANs?

jseley002 · ‎12-14-2015

No access-list is configured

Masoud Pourshabanian · ‎12-14-2015

Make sure subnet masks are configured correctly on all hosts. Subnet mask must be /24 on all hosts. And as I understood from your posts, default gateway is set on all hosts in VLAN 8.

Masoud

jseley002 · ‎12-14-2015

Thanks, all hosts are configured /24 subnets with the correct gateways.