Recently, I found a website which loads very slowly in Internet Explorer 11 (under Windows 7) while other browsers did not affected (Chrome, Firefox). The site has both IPv6 and IPv4 addresses. Tcpdump showed that connection to the IP address is failed, Destination unreachable ICMPv6 messages returned in reply to SYN packets. Despite the address is […]
Category: PC materials
It could be useful to know the build date of the executable. In most situations this is the file’s timestamp. It is quite simple to read it out in TDateTime format: However, there are situations when the file’s timestamp is altered and the build date is lost.
Today I had to install an Ubuntu 14.04.2 LTS system on a two-disk PC, with software RAID1, which I did many times before. The disks and raid setup went fine, but when reaching the GRUB install it reports “fatal error”. I skipped the bootloader install and finished the OS setup. Of course, the system didn’t […]
This little tool can generate sub-millisecond precision ICMP Echo messages. The interval between consecutive packets, the results or the waiting timeout are all in microseconds. The main idea behind this tool is the ICMP packets should be sent at constant interval so waiting for an outsanding message won’t block further messages. For instance, you cannot set packet […]