Bug 18093
Summary: | ICMP Checksum failure | ||
---|---|---|---|
Product: | [Retired] Red Hat Linux | Reporter: | Need Real Name <gconnell> |
Component: | net-tools | Assignee: | Crutcher Dunnavant <crutcher> |
Status: | CLOSED CURRENTRELEASE | QA Contact: | |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | 6.2 | CC: | pekkas |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i686 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2000-10-02 20:29:29 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Need Real Name
2000-10-02 14:25:36 UTC
I wasn't able to reproduce this on RH6.0, RH6.2 or RH7.0. Are you sure your Cisco isn't misbehaving? For example, could there be some kind of 'drop too big pings' issue there? FWIW, using kernel-2.2.16-3 (and up) here. Nope. I used a Sniffer(TM) device set up for Ethernet to snoop on the frames coming out of my linux box. Each ICMP packet that was captured was reported as having a correct TCP header checksum, but each packet with odd sized payload was being flagged as having an incorrect ICMP checksum by the Sniffer, and was being dropped by the Cisco. I attached the linux box to other devices where I can force it to ignore checksum vlaues, and all sizes worked o.k. I also tried it for a range of sizes, from 64-10001 bytes. All odd sizes were computed wrong. I'm looking to blame drivers for my ethernet hardware, but I'm going to look through the ping checksum routine as well. I'm running Red Hat (Hedwig) 2.2.5-15 Kernel There was an odd-byte checksum problem fixed in ping. The ping in iputils-20000418-6 fixes the odd-byte checksum problem (and several things). |