Change Default TTL on PW4 permanenty? | OR where sysctl.conf

pavel-s · 12-09-2019, 08:26 PM

Hi,

I would like to change default TTL of PW4. When I connect to it via ssh and run:

Code:

sysctl net.ipv4.ip_default_ttl=65

It changes but until the next restart. After restarting the kindle the value is 64 again. What can be done in order to preserve it between reboots? It seems like sysctl.conf is the right place for it but it doesn't exist.

NiLuJe · 12-10-2019, 12:05 AM

You can run a grep for sysctl in the init scripts, I *think* that's the job of one of them.

Or you can just plug that in a new custom one.

Junket · 12-10-2019, 02:36 AM

I can't improve upon NiLuJe's advice.

But for anyone who might pull this thread up in a future search:

Code:

sysctl net.ipv4.ip_default_ttl=65

would be a session only setting.

To effect a persistent change (at least on a nix box), you'd need to
append the setting to sysctl.conf:

/etc/sysctl.conf:
net.ipv4.ip_default_ttl=65

Comments on XDA say that you need to create sysctl.conf (on some android phones). So if it's not in an init script, it might work to:

touch /system/etc/sysctl.conf or
touch /sys/etc/sysctl.conf

pavel-s · 12-11-2019, 02:56 AM

Quote:

Originally Posted by NiLuJe

You can run a grep for sysctl in the init scripts, I *think* that's the job of one of them.

Or you can just plug that in a new custom one.

It seems like there are no scripts/configs on PW4 that use sysctl. Though, it gave me directions, thanks. Sometimes you know how to do something but don't do it until someone suggest you

Quote:

Originally Posted by Junket

/etc/sysctl.conf

Creating /etc/sysctl.conf and adding net.ipv4.ip_default_ttl=65 to it didn't help. I haven't tried another paths though. Instead, I've just created default-ttl.conf inside /etc/upstart and added sysctl net.ipv4.ip_default_ttl=65 +another basic stuff that goes to /etc/upstart scripts. And it does the job.

12-09-2019, 08:26 PM	#1
pavel-s Enthusiast Posts: 35 Karma: 10 Join Date: Sep 2017 Device: PW3/4	Change Default TTL on PW4 permanenty? \| OR where sysctl.conf Hi, I would like to change default TTL of PW4. When I connect to it via ssh and run: Code: sysctl net.ipv4.ip_default_ttl=65 It changes but until the next restart. After restarting the kindle the value is 64 again. What can be done in order to preserve it between reboots? It seems like sysctl.conf is the right place for it but it doesn't exist.

12-10-2019, 02:36 AM	#3
Junket Nil adsuetudine maius Posts: 278 Karma: 500000 Join Date: Nov 2019 Location: US Device: PW4	I can't improve upon NiLuJe's advice. But for anyone who might pull this thread up in a future search: Code: sysctl net.ipv4.ip_default_ttl=65 would be a session only setting. To effect a persistent change (at least on a nix box), you'd need to append the setting to sysctl.conf: /etc/sysctl.conf: net.ipv4.ip_default_ttl=65 Comments on XDA say that you need to create sysctl.conf (on some android phones). So if it's not in an init script, it might work to: touch /system/etc/sysctl.conf or touch /sys/etc/sysctl.conf Last edited by Junket; 12-10-2019 at 02:52 AM.

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12-10-2019, 12:05 AM	#2
NiLuJe BLAM! Posts: 13,506 Karma: 26047190 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	You can run a grep for sysctl in the init scripts, I think that's the job of one of them. Or you can just plug that in a new custom one.

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