APIC GUI Access Issues

[mpaniwozik]

This may be the wrong place to post this question but I'm having a weird issue accessing the APIC GUI from my home internet. When on my ISPs service, I cannot access the GUI of any of my companies APICs. I can only ping the APIC IP with a max MTU size of 1362. Now, when I tether my phone to my comp, I can access the APIC GUI just fine and My max MTU ping size goes up to 1472. In talking with my ISP, they are supposedly allowing jumbo frames up to 4000 on their network and of course are saying the issue isn't on their end.

Just want to see if anyone here has experienced any thing similar or has recommendations on what to check. I've tried setting my MTU manually on my router so all traffic uses 1350 byte mtu's but nothing changed.

[joezersk]

You can check your APIC MTU from the CLI....

apic-ams# ifconfig oobmgmt
oobmgmt: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.50.129.241 netmask 255.255.255.0 broadcast 10.50.129.255
inet6 fe80::2ee:abff:fe81:97e2 prefixlen 64 scopeid 0x20<link>
ether 00:ee:ab:81:97:e2 txqueuelen 1000 (Ethernet)
RX packets 7276111 bytes 5348378253 (4.9 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4507287 bytes 2880583715 (2.6 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

It makes sense you can only ping up to 1472 as you need to account for 20 bytes for IP header plus 8 bytes for ICMP header.  If your APIC oobmgmt is correct (and it should be, since why would you ever change it?) there is something else going on in the path in-between. I don't think this is an APIC issue, is what I mean.