HI Again My Sir /Rob
iam using UNL lab :-
Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version 15.5(2)T, DEVELOPMENT TEST SOFTWARE
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Thu 26-Mar-15 07:36 by prod_rel_team
ROM: Bootstrap program is Linux
R1 uptime is 0 minutes
System returned to ROM by reload at 0
System image file is "unix:/opt/unetlab/addons/iol/bin/L3-ADVENTERPRISEK9-M-15.5-2T.bin"
Last reload reason: Unknown reason
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Linux Unix (Intel-x86) processor with 874020K bytes of memory.
Processor board ID 67108868
4 Ethernet interfaces
4 Serial interfaces
1024K bytes of NVRAM.
Configuration register is 0x0
now as you can see that means this unl lab has error when i type secondary ip address on serial interface ?
what`s your opinion about UNL ?Is He good OR Bad? It`s only Program i can use it because it`s free