From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.5)
Gecko/20031007 Firebird/0.7

Description of problem:
net-tools-1.60-7
iproute-2.4.7-7.80.1
(somewhat gruyerish kernel-2.4.18-14)

# route -nee
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref   
Use Iface    MSS   Window irtt
....   0.0.0.0         .... U     0      0        0 eth0     0     0 
    0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0       
0 lo       0     0      0
0.0.0.0         ....   0.0.0.0         UG    0      0        0 eth0  
  536   0      0

# ip route ls
..../.. dev eth0  scope link
127.0.0.0/8 dev lo  scope link
default via .... dev eth0  advmss 496

/proc/net/route
Iface   Destination     Gateway         Flags   RefCnt  Use     Metric
 Mask
MTU     Window  IRTT
eth0    ........        00000000        0001    0       0       0    
  ........
0       0       0

lo      0000007F        00000000        0001    0       0       0    
  000000FF
0       0       0

eth0    00000000        ........        0003    0       0       0    
  00000000
536     0       0



Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.boot
2.ip route change default via .... advmss 496
3.route -nee
4.ip route ls
5.cat /proc/net/route
(just one machine tried)
    

Additional info:

or please little more explanation in "ip route help" or route manpage
if what i see is correct...