Increasing TTL Time

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simistef
DD-WRT Novice


Joined: 28 Dec 2007
Posts: 23
PostPosted: Sun Dec 30, 2007 9:17    Post subject: Increasing TTL Time Reply with quote
Hello guys !

My ISP is sending me packages with TTL = 1 so passing the router is impossible. I can see when pinging yahoo.com from the router that TTL is 1.

How can i increase the TTL time in DD-WRT ? Is it possible ?

Thank you in advance !
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RolF
DD-WRT User


Joined: 28 Sep 2007
Posts: 349
Location: CCCP
PostPosted: Sun Dec 30, 2007 9:57    Post subject: Reply with quote
try save firewall
Code:
iptables -t mangle -I PREROUTING -i ppp0 -j TTL --ttl-set 10
for PPPoE

or

Code:
iptables -t mangle -I PREROUTING -i vlan1 -j TTL --ttl-set 10
for cable ...

R.
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simistef
DD-WRT Novice


Joined: 28 Dec 2007
Posts: 23
PostPosted: Sun Dec 30, 2007 11:41    Post subject: Reply with quote
Nope...still not working :(

Ping from yahoo.com is with TTL = 1
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simistef
DD-WRT Novice


Joined: 28 Dec 2007
Posts: 23
PostPosted: Sun Dec 30, 2007 12:34    Post subject: Reply with quote
i've finally make it to work

This was the solution:

iptables -t mangle -F PREROUTING
iptables -A PREROUTING -t mangle -d WAN_IP_ADDRESS -j TTL --ttl-set 10
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spalding
DD-WRT Novice


Joined: 28 Sep 2008
Posts: 4
PostPosted: Tue Sep 30, 2008 21:36    Post subject: Reply with quote
and what do i do if my ping from yahoo.com is 0
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sharo
DD-WRT User


Joined: 22 Nov 2007
Posts: 63
PostPosted: Wed Oct 01, 2008 6:53    Post subject: Reply with quote
Same thing Smile
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switch
DD-WRT Guru


Joined: 30 Apr 2008
Posts: 967
Location: Romania
PostPosted: Wed Oct 01, 2008 6:57    Post subject: Reply with quote
Read the Wiki more? There's a tutorial there for doing just this kind of thing.
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Q: How do I do ...? A: Read the tutorials or Search forums
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armyworm
DD-WRT Novice


Joined: 21 Nov 2008
Posts: 4
PostPosted: Fri Nov 21, 2008 15:01    Post subject: Reply with quote
Hi,

I have the same issue. My ISP set TTL=1
The router is WRT54G ver.5.1 with "dd wrt v.24 mirco generic" firmware.
I use Static IP and I'm cloning the MAC.

I read the post here and the Wiki iptables article, tried all of the commands in the Administrations tab, but nothig helps.

Please advise!
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barut
DD-WRT Novice


Joined: 25 May 2010
Posts: 1
PostPosted: Tue May 25, 2010 12:31    Post subject: Reply with quote
simistef wrote:
i've finally make it to work

This was the solution:

iptables -t mangle -F PREROUTING
iptables -A PREROUTING -t mangle -d WAN_IP_ADDRESS -j TTL --ttl-set 10


Hello,
in this case it will work even just
Code:
iptables -A PREROUTING -t mangle -d WAN_IP_ADDRESS -j TTL --ttl-set 10


But what will happen, if you have dynamic IP or PPPoE?
You must use
Code:
iptables -t mangle -I PREROUTING -i `nvram get wan_iface` -j TTL --ttl-set 10

Here you can find usefull information -> http://www.dd-wrt.com/wiki/index.php/Iptables#Modifying_the_TTL
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