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Cisco OSPF and Windows RRAS OSPF May 24, 2009

Posted by daakeung in Cisco, IT, Microsoft.
Tags: , , ,
1 comment so far

I’ve been battling with getting Windows RRAS ospf and Cisco ios ospf to become neighbours for the past few days.

If you turn on ospf debug in windows and the following shows up :

Rejected an OSPF packet from x.x.x.x to 224.0.0.5 because the OSPF data length in the OSPF header was 48 but the length calculated from the IP Header fields was 60.

You should disable the following on the cisco ios:

router ospf 100

no capability lls

Also, if you are running ISA with RRAS you should disable  “block fragmentation”

For more information:

http://technet.microsoft.com/en-us/library/cc302678.aspx#NetworkAndRoutingIssues

http://www.cisco.com/en/US/docs/ios/12_3/iproute/command/reference/ip2_c1g.html#wp1036468

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Using CISCO IOS AUX port to access the console port on another device (reverse telnet) May 16, 2009

Posted by daakeung in Uncategorized.
Tags: , , ,
4 comments

Setup a loopback interface:

int lo 1
ip address 10.1.1.1 255.255.255.255

line aux 0
transport input telnet
speed 9600

To access the aux interface, you telnet to the loopback address on port 2000+line#

for example:

sh line
Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
0 CTY              –    –      –    –    –      0       0     0/0       –
I    1 TTY              – inout     –    –    –      0       0     0/0       –
5 AUX   9600/9600  – inout     –    –    –      0       0     0/0       –
*    6 VTY              –    –      –    –    –     78       0     0/0       –
7 VTY              –    –      –    –    –      2       0     0/0       –
8 VTY              –    –      –    –    –      0       0     0/0       –
9 VTY              –    –      –    –    –      0       0     0/0       –
10 VTY              –    –      –    –    –      0       0     0/0       –

telnet 10.1.1.1 2005

***UPDATED***

Using Cisco IOS to determine Serial Number May 8, 2009

Posted by daakeung in Cisco, IT.
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Have any of you ever had to find out the S/N of a remote cisco ios device?

You can issue the following IOS command:

show inventory

This produces the PID, the MODEL number of the device and also the Serial Number, this can be useful when auditing your network.