There is a good chance I'm just doing something wrong. However, after spending a couple of hours trying to troubleshoot, I'm a little perplexed as to why things are not working how I expect them to and thought I might try reaching out to the Pros.The...
Forum Posts
Another question for the Pros for Lab IPv6 Routing in Chapter 24 (1/e) I have completed the entire Lab got 100% all pings working Except for PC4 pinging PC1 R4 can Ping PC1 but the tracert just stops dead at R4's Gi0/0 interface. There are no Access-...
If I ping tools.cisco.com it is successful via ipv4:ROUTER# ping tools.cisco.comType escape sequence to abort.Sending 5, 100-byte ICMP Echos to 173.37.145.8, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 62/62/...
I'm doing IBNS 2.0 dot1x/MAB in closed mode and I'm pushing some IPv4 and IPv6 ACLs via RADIUS to some C3650 switches running the latest IOS-XE 16.12.12. After digging through documentation to understand how to display the dACLs that are applied, it...
Hi,probably a noob question and problem for Cisco-wizards, but has anyone route64.org IPv6-tunnel config to share? IPv6 tunnelbrokers seem to close one after one, whilst I'm stuck with IPv4 world with my ISP. I have used so far Hurricane Electric tun...
Can someone help me with a question I have about ipv6 and the NDP table of the ROUTER, it happens that when I put the SH IPV6 NEIGHBORD command to see the ND table, similar to ARP, I find that I see all the MAC and IP addresses stored in the ROUTER, ...
Resolved! Ipv6 DHCP Guard and RA Guard Policy
My company that I work for currently does not use IPv6 in our organization. We currently only use IPv4. During our annual penetration test last month, the pentesters were able to reply to IPv6 DHCPv6 requests to successfully hijack DNS for workstat...
Hi,I have been banging my head against the wall with Nexus 92160YC-X for a while.We are running a EVPN-VXLAN based network with mostly Juniper gear and are looking to add one Nexus switch to provide L2 ports (so no L3 SVI:s or anything. Just bridge p...
I have two static routes "ip route 103.246.86.0 255.255.254.0 NULL 0" and "ip route 103.246.86.0 255.255.255.0 NULL 0". My traffic having trouble to reach global website like Yahoo but once I removed "ip route 103.246.86.0 255.255.255.0 NULL 0", my t...
I have recently replaced a Catalyst 4507 with a 9407. Since the upgrade, several HP iLO have stopped being accessible from outside their VLAN. This is resolvable by going to each iLO and disabling the setting that tells it to prefer IPv6. What I'd...
Hello,As you probably know, DHCPv6 doesn't provide default route to the client (by design). ICMPv6 RA does, and the client instantiates a default route only if it considers itself as a host, as per rfc4861#section-6.3.6.Now, let's say the client is a...
Resolved! Ipv6 DHCP Guard and RA Guard Policy
Hello. My company that I work for currently does not use IPv6 in our organization. We currently only use IPv4. During our annual penetration test last month, the pentesters were able to reply to IPv6 DHCPv6 requests to successfully hijack DNS for ...
Hello, I am trying to figure out how to get IPv6 prefix delegation back working on a C1111-4P that I have for testing. It has a WAN int g0/0/0 connected to residential Comcast, and VLAN 1 and 20 which have prefixes delegated. Everything was working f...
Hello everyone,Unfortunately I have a problem again.I have two ISR 1100 routers which are connected to the Internet with a separate CG522-E (which does passthrough).The CG522-E is a type of modem.I have configured a GRE ipv6 tunnel on both ISRs throu...
Hi guys, I'm having trouble configurating the OSPF for ipv6.It happens that all my router have lesser networks that it supposed to have.command lines as below, same goes to another 5 more routersR1>enableR1#config termEnter configuration commands, on...
