Tag Info

Hot answers tagged

41

That behavior is actually due to a normal feature of ping and has no relation to your actual hardware. Indeed, prefixing the IP address (or part of it) with a leading zero will cause the number to be interpreted as octal. So 057 means 57 in base 8 which is 47. Thus ping will send the ICMP query to the machine located at address 10.10.208.47 and therefore ...


14

Ping, like many other unix programs, use the C libraries on your unix system for name resolution. One of the functions used is inet_aton. The man page for inet_aton says: All numbers supplied as ``parts'' in a `.' notation may be decimal, octal, or hexadecimal, as specified in the C language (i.e., a leading 0x or 0X implies hexadecimal; otherwise, a ...


3

I'd do it via iptables. Pingdom have a specific set of IP addresses they use, and, unsurprisingly, make the list public. https://support.pingdom.com/Knowledgebase/Article/View/16/0/where-can-i-find-a-list-of-ip-addresses-for-the-pingdom-probe-servers You could retrieve the list, and script the process of creating iptables drop rules for them.


2

I think the problem may be with your NS record in db.pro.lan. Your line starts with pro.lan which does not end in a . so will have the pro.lan automatically appended by bind so your domain there will become pro.lan.pro.lan. which isn't what you want. If you just remove the pro.lan you should get what you want from that zone. So your NS record will now ...


1

check firewall in guest, disable it if you could just for test.


1

In addition to the DNS lookuping issue, it may also caused by the interval between ping packets: -i interval Wait interval seconds between sending each packet. The default is to wait for one second between each packet normally, or not to wait in flood mode. Only super-user may set interval to values less 0.2 seconds. If you ping ...


1

Having the same problem here. Solution is to flush the IPV6 route cache after setting the route: ip -6 route flush cache Changing your interfaces section to: ... auto virbr_external iface virbr_external inet6 static bridge_ports none bridge_stp off bridge_fd 0 address 2a01:4f8:X:Y:1::2 netmask 80 up ip -6 route add 2a01:4f8:X:Y:2::/80 ...



Only top voted, non community-wiki answers of a minimum length are eligible