12-16-2007 08:06 AM - edited 03-05-2019 08:01 PM
can someone explain why from a pc directly connected to a router ethernet interface pings the ethernet interface ok but cannot ping the serial interface on the same router. Serial interface is connected with back to back cable with another router and protocol is up.
12-16-2007 08:11 AM
The serial interface belongs to another IP subnet.
Does the PC has a route to the serial interface with a gateway of the LAN interface ?
or
a default route pointing to the LAN interface of such router ?
12-16-2007 12:44 PM
yes to give you more details my nic ip address is 10.0.0.1/8 gateway 10.0.0.200 Router lan interface ip 10.0.0.200 router serial interface ip 192.168.2.250
when I ping the serial interface I get request timed out, the router should forward the packet to the serial interface and return the icmp reply back am I correct ?
12-16-2007 12:54 PM
Correct.
Can the router ping its own serial interface ?
12-16-2007 01:15 PM
yes it can
12-16-2007 01:20 PM
Check for any FW on the PC or an ACL in the LAN interface at the router.
Additionally, let's see the IPCONFIG /ALL from the PC and show run from the router.
12-16-2007 01:21 PM
Hi,
Check if there is any access list applied on serial or ethernet interface blocking the ping from ur PC.
HTH
Deepinder Singh Babbar
12-16-2007 01:55 PM
I think that a firewall problem on my pc should be excluded since I can ping the lan interface of the router, am I correct ? I will check for any access-lists and also post run conf and pc ip conf all in a few minutes
12-16-2007 02:08 PM
I types show access-lists and it gave nothing. here is my run conf
RouterA#show access-lists
RouterA#show run
Building configuration...
Current configuration : 1038 bytes
!
version 12.3
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname RouterA
!
boot-start-marker
boot system tftp c1600z.123-6.bin 10.0.0.1
boot system flash c1600-sy-mz.122-3.bin
boot system rom
boot-end-marker
!
enable password 7 094D5E
!
no aaa new-model
ip subnet-zero
ip domain name andrea.com
ip name-server 10.0.0.1
!
!
!
!
!
!
!
interface Loopback2
ip address 172.0.0.200 255.255.0.0
!
interface Ethernet0
ip address 10.0.0.200 255.0.0.0
!
interface Serial0
bandwidth 1000
ip address 192.168.2.250 255.255.255.0
clockrate 1000000
no fair-queue
!
router ospf 100
log-adjacency-changes
network 10.0.0.0 0.255.255.255 area 0
network 192.168.2.0 0.0.0.255 area 0
!
ip classless
no ip http server
no ip http secure-server
!
!
!
banner motd ^C That's Better ^C
!
line con 0
exec-timeout 0 0
password 7 08205C
login
transport preferred all
transport output all
line vty 0 4
password 7 15131B
login
transport preferred all
transport input all
transport output all
!
!
end
Windows IP Configuration
Ethernet adapter to cisco 1600 A:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::45ea:b102:be6d:6699%23
IPv4 Address. . . . . . . . . . . : 10.0.0.1
Subnet Mask . . . . . . . . . . . : 255.0.0.0
Default Gateway . . . . . . . . . : 10.0.0.200
Ethernet adapter connected to internet:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::599c:cca:5df1:d536%21
IPv4 Address. . . . . . . . . . . : 172.0.0.60
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 172.0.0.50
Ethernet adapter Loopback for testing:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::3823:fa39:f739:f8e9%18
IPv4 Address. . . . . . . . . . . : 192.168.1.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
Ethernet adapter Local Area Connection 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Ethernet adapter NAT to internet:
Connection-specific DNS Suffix . : gateway.2wire.net
Link-local IPv6 Address . . . . . : fe80::e45c:1e97:a735:bbd3%8
IPv4 Address. . . . . . . . . . . : 192.168.1.104
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254
Tunnel adapter Local Area Connection* 6:
Connection-specific DNS Suffix . : gateway.2wire.net
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.1.104%26
Default Gateway . . . . . . . . . :
Tunnel adapter Local Area Connection* 14:
Connection-specific DNS Suffix . :
Temporary IPv6 Address. . . . . . : 2002:ac00:3c::ac00:3c
Default Gateway . . . . . . . . . : 2002:c058:6301::c058:6301
Tunnel adapter Local Area Connection* 9:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Tunnel adapter Local Area Connection* 10:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Tunnel adapter Local Area Connection* 16:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.1.1%20
Default Gateway . . . . . . . . . :
Tunnel adapter Local Area Connection* 19:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::200:5efe:172.0.0.60%25
Default Gateway . . . . . . . . . :
Tunnel adapter Local Area Connection* 20:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::5efe:10.0.0.1%27
Default Gateway . . . . . . . . . :
12-16-2007 02:20 PM
Hi
You seem to have at least 3 different default-gateways on your PC.
Can you run a "netstat -nr" on your PC to have a look at the routing table.
To check whether this is the issue on your PC from a cmd prompt
route add 192.168.2.0 mask 255.255.255.0 10.0.0.200
HTH
Jon
12-16-2007 02:28 PM
===========================================================================
Interface List
23 ...00 0a cd 07 44 a8 ...... Realtek RTL8139/810x Family Fast Ethernet NIC #2
21 ...00 50 bf 06 3e 27 ...... Realtek RTL8139/810x Family Fast Ethernet NIC
18 ...02 00 4c 4f 4f 50 ...... Microsoft Loopback Adapter
11 ...22 22 22 22 22 22 ...... Bluetooth PAN Network Adapter
8 ...00 0c 6e fb 98 bf ...... VIA Rhine II Compatible Fast Ethernet Adapter
1 ........................... Software Loopback Interface 1
26 ...00 00 00 00 00 00 00 e0 isatap.gateway.2wire.net
28 ...00 00 00 00 00 00 00 e0 6TO4 Adapter
10 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface
15 ...00 00 00 00 00 00 00 e0 isatap.{0B8AD8E2-F222-4D54-99CB-89DEF8EA1138}
20 ...00 00 00 00 00 00 00 e0 isatap.{F2B187DD-14C8-4227-BE1A-09A1AF315CBD}
25 ...00 00 00 00 00 00 00 e0 isatap.{A2F9967D-2AEC-4A14-93C9-D6665EC877AF}
27 ...00 00 00 00 00 00 00 e0 isatap.{2C61AD31-7461-4F7E-B80B-7944B7886233}
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.0.0.200 10.0.0.1 286
0.0.0.0 0.0.0.0 172.0.0.50 172.0.0.60 286
0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.104 20
10.0.0.0 255.0.0.0 On-link 10.0.0.1 286
10.0.0.1 255.255.255.255 On-link 10.0.0.1 286
10.255.255.255 255.255.255.255 On-link 10.0.0.1 286
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
172.0.0.0 255.255.0.0 On-link 172.0.0.60 286
172.0.0.60 255.255.255.255 On-link 172.0.0.60 286
172.0.255.255 255.255.255.255 On-link 172.0.0.60 286
192.168.1.0 255.255.255.0 On-link 192.168.1.1 286
192.168.1.0 255.255.255.0 On-link 192.168.1.104 276
192.168.1.1 255.255.255.255 On-link 192.168.1.1 286
192.168.1.104 255.255.255.255 On-link 192.168.1.104 276
192.168.1.255 255.255.255.255 On-link 192.168.1.1 286
192.168.1.255 255.255.255.255 On-link 192.168.1.104 276
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.1 286
224.0.0.0 240.0.0.0 On-link 10.0.0.1 286
224.0.0.0 240.0.0.0 On-link 172.0.0.60 286
224.0.0.0 240.0.0.0 On-link 192.168.1.104 276
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.1 286
255.255.255.255 255.255.255.255 On-link 10.0.0.1 286
255.255.255.255 255.255.255.255 On-link 172.0.0.60 286
255.255.255.255 255.255.255.255 On-link 192.168.1.104 276
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 10.0.0.200 Default
0.0.0.0 0.0.0.0 172.0.0.50 Default
===========================================================================
IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
28 1140 ::/0 2002:c058:6301::c058:6301
1 306 ::1/128 On-link
28 1040 2002::/16 On-link
28 296 2002:ac00:3c::ac00:3c/128
On-link
18 286 fe80::/64 On-link
23 286 fe80::/64 On-link
21 286 fe80::/64 On-link
8 276 fe80::/64 On-link
27 296 fe80::5efe:10.0.0.1/128 On-link
20 296 fe80::5efe:192.168.1.1/128
On-link
26 281 fe80::5efe:192.168.1.104/128
On-link
25 296 fe80::200:5efe:172.0.0.60/128
On-link
18 286 fe80::3823:fa39:f739:f8e9/128
On-link
23 286 fe80::45ea:b102:be6d:6699/128
On-link
21 286 fe80::599c:cca:5df1:d536/128
On-link
8 276 fe80::e45c:1e97:a735:bbd3/128
On-link
1 306 ff00::/8 On-link
18 286 ff00::/8 On-link
23 286 ff00::/8 On-link
21 286 ff00::/8 On-link
8 276 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
c:\Users\main\route add 192.168.2.0 255.255.255.0.10.0.0.200
route: bad argument 10.0.0.200
route add gave me the above error
Now I have to go but will be back trying to fix the problem tomorrow evening, thank you for your help and hope I can fix it.
12-16-2007 02:31 PM
Hi
You missed out the word "mask" in the command ie. you entered
route add 192.168.2.0
255.255.255.0.10.0.0.200
and it should be
route add 192.168.2.0 mask 255.255.255.0 10.0.0.200
Jon
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