01-30-2023 02:37 PM
Hi there,
I am attempting to do a trace route from a switch to an interface I have on a my ISE server however it is getting blocked. Does ISE (v2.6.0.156) have some sort of firewall that could be blocking the trace attempt?
Thanks!
Solved! Go to Solution.
01-31-2023 05:44 AM - edited 01-31-2023 05:46 AM
Hi @benbroadfoot ,
the iptables looks fine !!!
Please try the following two options:
1. If you have another ISE Node, try to traceroute from Node 2 to Node 1:
iseNode2/admin# traceroute <IP Addr of iseNode1>
traceroute to <IP Addr of iseNode1> (<IP Addr of iseNode1>), 30 hops max, 60 byte packets
1 <IP Addr of iseNode1> 0.469 ms 0.450 ms 0.449 ms
2. try to traceroute from your PC to Node 1 (using the following command) to check if the packet arrives at Node 1:
iseNode1/admin# tech dumptcp 0 | inc ICMP
10:35:05.130657 IP (tos 0x48, ttl 1, id 61535, offset 0, flags [none], proto ICMP (1), length 92)
<your PC IP Addr> > <IP Addr oof iseNode1>: ICMP echo request, id 1, seq 255, length 72
Hope this helps !!!
01-30-2023 03:59 PM
first try ping,
are ping success ?
01-30-2023 04:19 PM
01-30-2023 05:43 PM
Hi @benbroadfoot ,
about " ... have some sort of firewall that could be blocking the trace attempt... " ... at CLI, use the following command and search for iptables:
ise/admin# show tech-support
...
*****************************************
Running iptables -nvL...
*****************************************
...
Note: I'm able to traceroute an ISE on version 2.7.
Hope this helps !!
01-30-2023 08:02 PM
Thanks for the info @Marcelo Morais!
I have attached a screen shot of the start of the iptables section of the tech-support - what am I looking for exactly?
01-31-2023 05:44 AM - edited 01-31-2023 05:46 AM
Hi @benbroadfoot ,
the iptables looks fine !!!
Please try the following two options:
1. If you have another ISE Node, try to traceroute from Node 2 to Node 1:
iseNode2/admin# traceroute <IP Addr of iseNode1>
traceroute to <IP Addr of iseNode1> (<IP Addr of iseNode1>), 30 hops max, 60 byte packets
1 <IP Addr of iseNode1> 0.469 ms 0.450 ms 0.449 ms
2. try to traceroute from your PC to Node 1 (using the following command) to check if the packet arrives at Node 1:
iseNode1/admin# tech dumptcp 0 | inc ICMP
10:35:05.130657 IP (tos 0x48, ttl 1, id 61535, offset 0, flags [none], proto ICMP (1), length 92)
<your PC IP Addr> > <IP Addr oof iseNode1>: ICMP echo request, id 1, seq 255, length 72
Hope this helps !!!
01-31-2023 01:31 PM
Thanks @Marcelo Morais not sure why I didn't try this initially! I AM able to tracert to the ISE interface from a PC so I'm guessing the issue isn't with ISE at all. Strange it will not allow me from a switch but will allow me from a PC?
Thanks again for your tips!
01-31-2023 06:27 PM
@benbroadfoot , glad to be of help !!!
01-31-2023 07:00 AM
friend use traceroute with source IP
source IP is the IP you add to ISE for router/SW
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