Destination Host Unreachable but Gateway Pingable
Getting this?
[root@mdskvm-p05 ~]# ping 10.0.0.73
PING 10.0.0.73 (10.0.0.73) 56(84) bytes of data.
From 10.0.0.72 icmp_seq=1 Destination Host Unreachable
From 10.0.0.72 icmp_seq=2 Destination Host Unreachable
From 10.0.0.72 icmp_seq=3 Destination Host Unreachable
Pinging gateway works but doesn't go beyond that?
[root@mdskvm-p05 ~]# ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data.
64 bytes from 10.0.0.1: icmp_seq=1 ttl=255 time=1.75 ms
64 bytes from 10.0.0.1: icmp_seq=2 ttl=255 time=0.715 ms
Start by checking on Switch 2 where most of the cables are plugged into. One of the interfaces is set to VLAN 1 but no GE port is associated with it:
mdscisco02#
mdscisco02#show mac address-table | include 4ea
1 d89d.6723.4ea5 dynamic ip Port-channel4
2 d89d.6723.4ea4 dynamic ip,other GigabitEthernet1/12
2 d89d.6723.4ea6 dynamic ip,other GigabitEthernet1/13
2 d89d.6723.4ea7 dynamic ip,other GigabitEthernet1/15
mdscisco02#
mdscisco02#
mdscisco02#
mdscisco02#show mac address-table | include 827
2 2c44.fd96.8274 dynamic ip,other Port-channel4
2 2c44.fd96.8275 dynamic ip,ipx,other GigabitEthernet1/14
2 2c44.fd96.8276 dynamic ip,ipx,other GigabitEthernet1/11
2 2c44.fd96.8277 dynamic ip,ipx,other GigabitEthernet1/16
mdscisco02#
mdscisco02#
mdscisco02#
mdscisco02#show vlan
VLAN Name Status Ports
—- ——————————– ——— ——————————-
1 default active Gi1/2, Gi1/3, Gi1/4, Gi1/5, Gi1/6, Gi1/7, Gi1/8, Gi1/9, Gi1/10, Gi1/17, Gi1/18, Gi1/19
Gi1/20, Gi1/21, Gi1/22, Gi1/23, Gi1/24, Gi1/25, Gi1/26, Gi1/27, Gi1/28, Gi1/29, Gi1/30
Gi1/31, Gi1/32, Gi1/43, Gi1/44, Gi1/45, Gi1/46, Gi1/47, Gi1/48, Te1/49, Te1/50
2 VLAN0002 active Gi1/11, Gi1/12, Gi1/13, Gi1/14, Gi1/15, Gi1/16
3 VLAN0003 active
4 VLAN0004 active
5 VLAN0005 active Gi1/33, Gi1/34, Gi1/35, Gi1/36, Gi1/37, Gi1/38, Gi1/39, Gi1/40, Gi1/41, Gi1/42
1002 fddi-default act/unsup
1003 trcrf-default act/unsup
1004 fddinet-default act/unsup
1005 trbrf-default act/unsup
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
—- —– ———- —– —— —— ——– —- ——– —— ——
1 enet 100001 1500 – – – – – 0 0
2 enet 100002 1500 – – – – – 0 0
3 enet 100003 1500 – – – – – 0 0
4 enet 100004 1500 – – – – – 0 0
5 enet 100005 1500 – – – – – 0 0
1002 fddi 101002 1500 – – – – – 0 0
1003 trcrf 101003 4472 1005 3276 – – srb 0 0
1004 fdnet 101004 1500 – – – ieee – 0 0
1005 trbrf 101005 4472 – – 15 ibm – 0 0
VLAN AREHops STEHops Backup CRF
—- ——- ——- ———-
1003 7 7 off
Remote SPAN VLANs
——————————————————————————
Primary Secondary Type Ports
——- ——— —————– ——————————————
mdscisco02#
Verifying the cables shows 1 cable of each host is connected to the Cisco 3750. Checking on Switch 1 for the connection we see that one of the interfaces is set to VLAN 1:
mdscisco01#show mac address-table | include 827
2 2c44.fd96.8274 DYNAMIC Gi1/0/10
2 2c44.fd96.8275 DYNAMIC Po4
2 2c44.fd96.8276 DYNAMIC Po4
2 2c44.fd96.8277 DYNAMIC Po4
mdscisco01#
mdscisco01#
mdscisco01#show mac address-table | include 4ea
1 d89d.6723.4ea5 DYNAMIC Gi1/0/7
2 d89d.6723.4ea4 DYNAMIC Po4
2 d89d.6723.4ea6 DYNAMIC Po4
2 d89d.6723.4ea7 DYNAMIC Po4
mdscisco01#
After the change, Gi1/0/7 is set to VLAN 2:
!
interface GigabitEthernet1/0/5 # Needs to be removed. Cable plugged into 1/0/7 instead.
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet1/0/6
!
interface GigabitEthernet1/0/7
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet1/0/8
!
interface GigabitEthernet1/0/9
!
interface GigabitEthernet1/0/10
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet1/0/11
!
interface GigabitEthernet1/0/12
!
Verify the mac address-table above on both switches:
mdscisco02#show mac address-table | include 4ea
2 d89d.6723.4ea4 dynamic ip,other GigabitEthernet1/12
2 d89d.6723.4ea5 dynamic ip Port-channel4
2 d89d.6723.4ea6 dynamic ip,other GigabitEthernet1/13
2 d89d.6723.4ea7 dynamic ip,other GigabitEthernet1/15
mdscisco02#show mac address-table | include 827
2 2c44.fd96.8274 dynamic ip,other Port-channel4
2 2c44.fd96.8275 dynamic ip,ipx,other GigabitEthernet1/14
2 2c44.fd96.8276 dynamic ip,ipx,other GigabitEthernet1/11
2 2c44.fd96.8277 dynamic ip,ipx,other GigabitEthernet1/16
mdscisco02#
mdscisco01#show mac address-table | include 4ea
2 d89d.6723.4ea4 DYNAMIC Po4
2 d89d.6723.4ea5 DYNAMIC Gi1/0/7
2 d89d.6723.4ea6 DYNAMIC Po4
2 d89d.6723.4ea7 DYNAMIC Po4
mdscisco01#show mac address-table | include 827
2 2c44.fd96.8274 DYNAMIC Gi1/0/10
2 2c44.fd96.8275 DYNAMIC Po4
2 2c44.fd96.8276 DYNAMIC Po4
2 2c44.fd96.8277 DYNAMIC Po4
mdscisco01#
Verify on the OS itself that instead of this:
[root@mdskvm-p05 ~]# ping 10.0.0.73
PING 10.0.0.73 (10.0.0.73) 56(84) bytes of data.
From 10.0.0.72 icmp_seq=1 Destination Host Unreachable
a proper reply is seen instead:
[root@mdskvm-p05 network-scripts]# ping 10.0.0.73
PING 10.0.0.73 (10.0.0.73) 56(84) bytes of data.
64 bytes from 10.0.0.73: icmp_seq=1 ttl=64 time=0.295 ms
This was part of the issue but it still didn't fully resolve it. For the final fix, please see the no echo reply post.
Regards,
GM
