Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Default TTL

I've read in other posts here that Cisco devices start with TTL=255 in echo reply packets. Is this still true?

I'm troubleshooting a routing issue with several other autonomous systems/engineers. One engineer showed how a ping to one IP address has a TTL of 253 and a ping to the next hop down stream has a drastically different TTL of 126. The latter device is a Cisco 6500. The former is non-cisco, possibly Juniper.

1) Is there any way to get the Cat6k to show me TTL values?

2) Is it possible that the Cat6k is actually sending echo reply packets starting with TTL=128, instead of the 255 that my other research has indicated?

Cheers.

Everyone's tags (1)
3 REPLIES
New Member

Re: Default TTL

Re: Default TTL

I just Pinged to a 6509.

It replied with a standard TTL=255.

Are you able to Ping from that Juniper to your 6500 directly?

BR,

Milan

New Member

Re: Default TTL

I don't have access to the Juniper router. As well, troubleshooting has moved in a different direction so I'm not able to request that the other parties try that at this point.

1728
Views
0
Helpful
3
Replies