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Home > Forums > Data Transmission > Communication Protocols > TCP/IP Forum

TTL in linux

Read More Threads Like This One

iggystar (IS/IT--Management)

17 Jul 01 22:56

Anybody know how I can check and change the TTL for IP packets on a Red hat linux box with a vanilla off the shelf installation?

Thanks.

sixthsense (TechnicalUser)

19 Jul 01 5:31

At least after V1.1.59 (and most probably before) Linux uses "safe" values of 64 for both TCP and UDP default TTLs. As these values are "hardcoded", occasional modifications have to be done deep in the source - change the parameter sk->ip_ttl in file net/inet/af_inet.c to whatever you think is appropriate for you. Some pointers to find the position where sk->ip_ttl is set:
Linux V1.12.11:        net/inet/af_inet.c    line 695
Linux V1.3.45:        net/inet/af_inet.c    line 678
Linux V2.2.x:           net/ipv4/ipconfig.c     line 516
netconfig2.3 is a tool available from: ftp://cs.ucsd.edu/pub/csl/Netconfig/netconfig2.3.tar.gz
but use it on ur own risk.
Hope it helps
Kapil

Technical Director
Infovalley Interwebspiders Pvt. Ltd.
Microsoft Certified System Engineer
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