Wireless Networks Thread, TTL curious in Technical; I have a webserver (esspreso box) which is on the same subnet as the clients that access it. If I ...
4th May 2010, 12:12 PM #1
I have a webserver (esspreso box) which is on the same subnet as the clients that access it. If I ping any other host on the network I get a TTL=128 If I ping this box I get a TTL of 64. Does this mean it is going through a router to get there? I understood that the TTL would decrement each hop, however if I tracert this address it comes back with the one entry as it should for something on the same network. I believe that TTL can be set somewhere, is this set somewhere else, on the router or local machine? i have staff saying it's been flakey lately.
4th May 2010, 04:14 PM #2
No, it's just that the default TTL value for reply packets on that box is different to others that you've sampled. Valid values for TTL are 1 through 255.
Originally Posted by Hacksawbob
On a Windows box the echo request packet can be changed (see the documentation, http://www.microsoft.com/resources/d....mspx?mfr=true), but this does not affect the reply packet's TTL. To change that you need to change the default value on the remote box.
I believe that TTL can be set somewhere, is this set somewhere else, on the router or local machine?
It's not going to be TTL troubles, unless you know that packets are going missing. Since you don't have a router boundary to deal with, your TTLs aren't being decremented anyway, so this is an unrelated problem.
i have staff saying it's been flakey lately.
4th May 2010, 08:49 PM #3
As powdarmonkey says, each different OS can use a different TTL:
OS/Device Version Protocol TTL value
AIX 3.2, 4.1 ICMP 255
BSDI BSD/OS 3.1 and 4.0 ICMP 255
Cisco ICMP 254
HP-UX ICMP 255
HP-UX TCP 64
Juniper ICMP 64
Linux 2.0.x kernel ICMP 64
Linux 2.2.14 kernel ICMP 255
Linux 2.4 kernel ICMP 255
Linux Red Hat 9 ICMP and TCP 64
NetBSD ICMP 255
Solaris 2.5.1, 2.6, 2.7, 2.8 ICMP/TCP 255/64
SunOS 5.7 ICMP and TCP 255
Windows for Workgroups TCP and UDP 32
Windows 95 TCP and UDP 32
Windows 98 ICMP/TCP 128
Windows NT 4.0 TCP and UDP 128
Windows Server 2003 128
Windows XP ICMP/TCP/UDP 128
4th May 2010, 09:11 PM #4
Note, this table doesn't allow for local sysadmins making changes to the defaults.
Originally Posted by steve
6th May 2010, 08:12 AM #5
Right OK red hering, looking for my issues elsewhere... apple wireless has had the long bony finger of suspicion pointed at it!
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