Looks like you should've not used the $ show ip route | include 0/1$
this would've shown routes using any subints on g0/1 show ip route | include 0/1 -aaron -----Original Message----- From: cisco-nsp <[email protected]> On Behalf Of Eugene Grosbein Sent: Wednesday, August 19, 2020 12:05 PM To: Gert Doering <[email protected]> Cc: [email protected] Subject: Re: [c-nsp] ARP requests 19.08.2020 23:21, Gert Doering wrote: > On Wed, Aug 19, 2020 at 10:03:29PM +0700, Eugene Grosbein wrote: >> I have not such routes: the command "show ip route | include 0/1$" shows nothing. >> The interface Gi0/1 does not have any IP configuration itself, only its sub-interfaces have. > > Do you have a subinterface with no "encaps dot1q ..." configured? > That would be "untagged" then. Thanks, I did not think about it. There were some left-over subinterfaces in the configuration with empty settings at all (and without encapsulation) and I've just removed all such interfaces. Still, ARP requests continue to come. > Otherwise, ask the router - "debug arp" - and for each ARP request you > see it issue, check the routing whether it points directly to an > interface. Well, I have packet capture in my analyzer and I see all the details there, like this: # tcpdump -s0 -en -i $incoming ether dst ff:ff:ff:ff:ff:ff and ether src 00:26:99:28:e6:1a 23:59:06.629164 00:26:99:28:e6:1a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 60: Request who-has 10.19.0.19 tell 10.19.0.254, length 46 At the router: #show ip route 10.19.0.19 Routing entry for 10.19.0.0/24 Known via "connected", distance 0, metric 0 (connected, via interface) Redistributing via eigrp 200 Advertised by eigrp 200 Routing Descriptor Blocks: * directly connected, via GigabitEthernet0/1.10 Route metric is 0, traffic share count is 1 #show run int GigabitEthernet0/1.10 Building configuration... Current configuration : 260 bytes ! interface GigabitEthernet0/1.10 encapsulation dot1Q 10 ip address 10.19.1.254 255.255.255.0 secondary ip address 10.19.0.254 255.255.255.0 end (interface description and ip access-groups not shown) > (And never believe what switches say about tagging vs. not) I've saved capture to PCAP file and verified it with Wireshark, no tags. Still cannot understand why no tags. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
